DSTU2 FHIR Release 3 (STU)

This page is part of the FHIR Specification (v1.0.2: DSTU (v3.0.2: STU 2). 3). The current version which supercedes this version is 5.0.0 . For a full list of available versions, see the Directory of published versions . Page versions: R5 R4B R4 R3 R2 R3 R2

4.16 11.4 Resource MedicationStatement - Content

Pharmacy Work Group Maturity Level : 1 3   Trial Use Compartments : Patient , Practitioner , RelatedPerson

A record of a medication that is being consumed by a patient. A MedicationStatement may indicate that the patient may be taking the medication now, or has taken the medication in the past or will be taking the medication in the future. The source of this information can be the patient, significant other (such as a family member or spouse), or a clinician. A common scenario where this information is captured is during the history taking process during a patient visit or stay. The medication information may come from e.g. sources such as the patient's memory, from a prescription bottle, or from a list of medications the patient, clinician or other party maintains The primary difference between a medication statement and a medication administration is that the medication administration has complete administration information and is based on actual administration information from the person who administered the medication. A medication statement is often, if not always, less specific. There is no required date/time when the medication was administered, in fact we only know that a source has reported the patient is taking this medication, where details such as time, quantity, or rate or even medication product may be incomplete or missing or less precise. As stated earlier, the medication statement information may come from the patient's memory, from a prescription bottle or from a list of medications the patient, clinician or other party maintains. Medication administration is more formal and is not missing detailed information.

4.16.1 11.4.1 Scope and Usage

Common usage includes:

  • the recording of non-prescription and/or recreational drugs
  • the recording of an intake medication list upon admission to hospital
  • the summarization of a patient's "active medications" in a patient profile

A MedicationStatement may be used to record substance abuse or the use of other agents such as tobacco or alcohol. This would typically be done if these substances are intended to be inluded in clinical decision support checking (for example, interaction checking) and as part of an active medication list. If the intent is to populate social history and/or to include additional information (for example, desire to quit, amount per day, negative health effects), then it is better to record as an Observation that could then be used to populate Social History.

This resource does not produce a medication list, but it does produce individual medication statements that may be used in the List resource to construct various types of medication lists. Note that other medication lists can also be constructed from the other Pharmacy resources (e.g., MedicationOrder, MedicationRequest, MedicationAdministration).

A medication statement is not a part of the prescribe -> dispense -> administer sequence, but is a report by a patient, significant other or a clinician that one or more of the prescribe, dispense or administer actions has occurred, resulting is a belief that the patient is, has, or will be using a particular medication.

MedicationStatement is an event resource from a FHIR workflow perspective - see Workflow Event

4.16.2 11.4.2 Boundaries and Relationships

The MedicationStatement resource is used to record a medications or substances that the patient reports as being taken, not taking, have taken in the past or may take in the future. It can also be used to record medication use that is derived from other records such as a MedicationRequest. The statement is not used to request or order a medication, supply or device. When requesting medicaation, supplies or devices when there is a patient focus or instructions regarding their use, a MedicationRequest , SupplyRequest or DeviceRequest DeviceRequest should be used instead

The Medication domain includes a number of related resources

MedicationOrder MedicationRequest An order for both supply of the medication and the instructions for administration of the medicine to a patient.
MedicationDispense Provision of a supply of a medication with the intention that it is subsequently consumed by a patient (usually in response to a prescription).
MedicationAdministration When a patient actually consumes a medicine, or it is otherwise administered to them
MedicationStatement This is a record of a medication being taken by a patient or that a medication has been given to a patient, where the record is the result of a report from the patient or another clinician. clinician, or derived from supporting information (for example, Claim, Observation or MedicationRequest). A medication statement is not a part of the prescribe->dispense->administer sequence, but is a report that such a sequence (or at least a part of it) did take place, resulting in a belief that the patient has received a particular medication.

This resource is distinct from MedicationOrder MedicationRequest , MedicationDispense and MedicationAdministration . Each of those resources refer to specific events - an individual order, an individual provisioning of medication or an individual dosing. MedicationStatement is a broader assertion covering a wider timespan and is independent of specific events. The existence of resource instances of any of the preceding three types may be used to infer a medication statement. However, medication statements can also be captured on the basis of other information, including an assertion by the patient or a care-giver, the results of a lab test, etc.

This resource is referenced by AdverseEvent and goal Goal

4.16.3 11.4.3 Resource Content

Structure

Σ 1..1 Who is/was taking the medication 0..1 When the statement was asserted? ?! boolean True if medication is/was not being taken reasonNotTaken Σ I 0..* True if asserting 0..1 Further information about Σ Additional supporting What medication was taken medicationCodeableConcept CodeableConcept medicationReference Details of how Σ Reported dosage 0..1 When/how often was medication taken asNeededBoolean site[x] Σ 0..1 Where (on body) siteReference Reference ( BodySite ) Σ How Σ 0..1 CodeableConcept Range Σ 0..1 Dose quantity per unit of time rateRatio rateRange Range Σ Maximum dose that was consumed per unit
Name Flags Card. Type Description & Constraints doco
. . MedicationStatement I DomainResource Record of medication being taken by a patient
Reason for use is only permitted if wasNotTaken is false + Reason not taken is only permitted if wasNotTaken Taken is true No
Elements defined in Ancestors: id , meta , implicitRules , language , text , contained , extension , modifierExtension
. . . identifier Σ 0..* Identifier External identifier
. . patient . basedOn Σ 0..* Reference ( Patient MedicationRequest | CarePlan | ProcedureRequest | ReferralRequest ) Fulfils plan, proposal or order
. . informationSource . partOf Σ 0..* Reference ( Patient MedicationAdministration | Practitioner MedicationDispense | RelatedPerson MedicationStatement | Procedure | Observation ) Part of referenced event
. . dateAsserted . context Σ 0..1 dateTime Reference ( Encounter | EpisodeOfCare ) Encounter / Episode associated with MedicationStatement
. . . status ?! Σ 1..1 code active | completed | entered-in-error | intended | stopped | on-hold
MedicationStatementStatus ( Required )
. . wasNotTaken . category Σ 0..1 CodeableConcept Type of medication was not given usage
Reason Medication Not Given Codes MedicationStatementCategory ( Example Preferred )
. . reasonForUse[x] . medication[x] Σ 1..1 What medication was taken
Condition/Problem/Diagnosis SNOMED CT Medication Codes ( Example )
. . . . reasonForUseCodeableConcept medicationCodeableConcept CodeableConcept
. . . reasonForUseReference . medicationReference Reference ( Condition Medication )
. . . effective[x] Σ 0..1 Over what period was The date/time or interval when the medication consumed? was taken
. . . . effectiveDateTime dateTime
. . . . effectivePeriod Period
. . note . dateAsserted Σ 0..1 string dateTime When the statement was asserted?
. . supportingInformation . informationSource 0..* 0..1 Reference ( Any Patient | Practitioner | RelatedPerson | Organization ) Person or organization that provided the information about the taking of this medication
. . medication[x] . subject Σ 1..1 Reference ( Medication ) dosage Patient Σ 0..* BackboneElement | Group ) Who is/was taking the medication was taken
. . text . derivedFrom 0..1 0..* string Reference ( Any ) Additional supporting information
. . timing . taken ?! Σ 1..1 Timing code y | n | unk | na
asNeeded[x] MedicationStatementTaken ( Required Σ 0..1 Take "as needed" (for x) )
. . . reasonNotTaken boolean asNeededCodeableConcept I 0..* CodeableConcept True if asserting medication is/was administered was not given
SNOMED CT Anatomical Structure for Administration Site Drugs not taken/completed Codes ( Example ) siteCodeableConcept CodeableConcept
. . route . reasonCode 0..1 0..* CodeableConcept Reason for why the medication entered the body is being/was taken
SNOMED CT Route Condition/Problem/Diagnosis Codes ( Example )
. . method . reasonReference Technique used to administer medication 0..* quantity[x] Reference ( Condition Σ 0..1 Amount administered in one dose quantityQuantity SimpleQuantity | Observation quantityRange ) Condition or observation that supports why the medication is being/was taken
. . rate[x] . note 0..* Ratio Annotation Further information about the statement
. . maxDosePerPeriod . dosage 0..1 0..* Ratio Dosage Details of time how medication is/was taken or should be taken

doco Documentation for this format

UML Diagram ( Legend )

MedicationStatement ( DomainResource ) External identifier - FHIR will generate its own internal identifiers (probably URLs) which do not need to be explicitly managed by the resource. The identifier here is one that would be used by another non-FHIR system - for example an automated medication pump would provide a record each time it operated; an administration while the patient was off the ward might be made with a different system and entered after the event. Particularly important if these records have to be updated identifier : Identifier [0..*] The person A plan, proposal or animal who is/was taking the medication order that is fulfilled in whole or in part by this event patient basedOn : Reference [1..1] « Patient [0..*] MedicationRequest » | CarePlan | ProcedureRequest | ReferralRequest The person who provided the information about the taking A larger event of which this medication particular event is a component or step informationSource partOf : Reference [0..1] « Patient | Practitioner [0..*] MedicationAdministration | RelatedPerson MedicationDispense | MedicationStatement | Procedure | Observation » The date when the medication statement was asserted by encounter or episode of care that establishes the information source context for this MedicationStatement dateAsserted context : dateTime Reference [0..1] Encounter | EpisodeOfCare A code representing the patient or other source's judgment about the state of the medication used that this statement is about. Generally this will be active or completed (this element modifies the meaning of other elements) status : code [1..1] « A set of codes coded concept indicating the current status of a MedicationStatement. (Strength=Required) MedicationStatementStatus ! » Set this to true if the record is saying that the medication was NOT taken (this element modifies the meaning Indicates where type of other elements) wasNotTaken : boolean [0..1] A code indicating why medication statement and where the medication was not taken is expected to be consumed or administered reasonNotTaken category : CodeableConcept [0..*] « [0..1] A set of codes indicating coded concept identifying where the reason why medication included in the MedicationAdministration medicationstatement is negated. (Strength=Example) expected to be consumed or administered (Strength=Preferred) Reason Medication Not Given MedicationStatementCategory ?? » ? A reason for why Identifies the medication being administered. This is being/was taken either a link to a resource representing the details of the medication or a simple attribute carrying a code that identifies the medication from a known list of medications reasonForUse[x] medication[x] : Type [0..1] « [1..1] CodeableConcept | Reference ( Condition Medication ); Codes A coded concept identifying why the medication is substance or product being taken. (Strength=Example) Condition/Problem/Diagnosis SNOMED CT Medication ?? » The interval of time during which it is being asserted that the patient was taking the medication (or was not taking, when the wasNotGiven element is true) effective[x] : Type [0..1] « dateTime | Period » Provides extra information about The date when the medication statement that is not conveyed was asserted by the other attributes information source note dateAsserted : string dateTime [0..1] Allows linking the MedicationStatement to the underlying MedicationOrder, The person or to other information organization that supports the MedicationStatement supportingInformation : Reference [0..*] « Any » Identifies provided the medication being administered. This is either a link to a resource representing information about the details taking of the medication or a simple attribute carrying this medication. Note: Use derivedFrom when a code that identifies the medication MedicationStatement is derived from a known list of medications other resources, e.g Claim or MedicationRequest medication[x] informationSource : Type [1..1] « CodeableConcept | Reference ( Medication [0..1] Patient ) » Dosage | Practitioner | Free text dosage information as reported about a patient's medication use. When coded dosage information is present, the free text may still be present for display to humans text RelatedPerson : string | Organization [0..1] The timing schedule for giving person, animal or group who is/was taking the medication to the patient. The Schedule data type allows many different expressions, for example. "Every 8 hours"; "Three times a day"; "1/2 an hour before breakfast for 10 days from 23-Dec 2011:"; "15 Oct 2013, 17 Oct 2013 and 1 Nov 2013" timing subject : Timing Reference [1..1] Patient | Group [0..1] Indicates whether the Medication is only taken when needed within a specific dosing schedule (Boolean option), or it indicates the precondition for taking Allows linking the Medication (CodeableConcept). Specifically if 'boolean' datatype is selected, then MedicationStatement to the following logic applies: If set underlying MedicationRequest, or to True, this indicates other information that the medication supports or is only taken when needed, within used to derive the specified schedule MedicationStatement asNeeded[x] derivedFrom : Type [0..1] « boolean Reference | CodeableConcept [0..*] Any » A coded specification Indicator of or a reference to the anatomic site where certainty of whether the medication first enters was taken by the body patient (this element modifies the meaning of other elements) site[x] taken : Type [0..1] « CodeableConcept | Reference ( BodySite code ); [1..1] A coded concept describing the site location the medicine enters into identifying level of certainty if patient has taken or onto has not taken the body. (Strength=Example) medication (Strength=Required) SNOMED CT Anatomical Structur... ?? » MedicationStatementTaken ! A code specifying indicating why the route or physiological path of administration of a therapeutic agent into or onto a subject medication was not taken route reasonNotTaken : CodeableConcept [0..1] « [0..*] A coded concept describing indicating the route or physiological path of administration of a therapeutic agent into or onto reason why the body of a subject. medication was not taken (Strength=Example) SNOMED CT Route Drugs not taken/com... ?? » A coded value indicating the method by which reason for why the medication is intended to be or was introduced into or on the body. This attribute will most often NOT be populated. It is most commonly used for injections. For example, Slow Push, Deep IV being/was taken method reasonCode : CodeableConcept [0..1] [0..*] The amount of therapeutic or other substance given at one administration event A coded concept identifying why the medication is being taken. (Strength=Example) quantity[x] : Type [0..1] « Quantity ( SimpleQuantity )| Range Condition/Problem/Diagnosis » ?? Identifies the speed with which the medication was or will be introduced into the patient. Typically the rate for an infusion e.g. 100 ml per 1 hour Condition or 100 ml/hr. May also be expressed as a rate per unit of time e.g. 500 ml per 2 hours. Currently we do not specify a default of '1' in observation that supports why the denominator, but this medication is being discussed. Other examples: 200 mcg/min or 200 mcg/1 minute; 1 liter/8 hours being/was taken rate[x] reasonReference : Type Reference [0..1] « Ratio [0..*] Condition | Range Observation » The maximum total quantity of a therapeutic substance Provides extra information about the medication statement that may be administered to a subject over is not conveyed by the period of time. For example, 1000mg in 24 hours other attributes maxDosePerPeriod note : Ratio Annotation [0..1] [0..*] Indicates how the medication is/was used or should be taken by the patient dosage : Dosage [0..*]

XML Template 

<

<MedicationStatement xmlns="http://hl7.org/fhir"> doco

 <!-- from Resource: id, meta, implicitRules, and language -->
 <!-- from DomainResource: text, contained, extension, and modifierExtension -->
 <</identifier>
 <</patient>
 <</informationSource>
 <
 <
 <
 <</reasonNotTaken>
 <</reasonForUse[x]>
 <</effective[x]>
 <
 <</supportingInformation>
 <</medication[x]>
 <
  <
  <</timing>
  <<a title="Indicates whether the Medication is only taken when needed within a specific dosing schedule (Boolean option), or it indicates the precondition for taking the Medication (CodeableConcept).  

Specifically if 'boolean' datatype is selected, then the following logic applies:  If set to True, this indicates that the medication is only taken when needed, within the specified schedule." class="dict" href="medicationstatement-definitions.html#MedicationStatement.dosage.asNeeded[x]"></asNeeded[x]>
  <</site[x]>
  <</route>
  <</method>
  <</quantity[x]>
  <</rate[x]>
  <</maxDosePerPeriod>
 </dosage>

 <identifier><!-- 0..* Identifier External identifier --></identifier>
 <basedOn><!-- 0..* Reference(MedicationRequest|CarePlan|ProcedureRequest|
   ReferralRequest) Fulfils plan, proposal or order --></basedOn>

 <partOf><!-- 0..* Reference(MedicationAdministration|MedicationDispense|
   MedicationStatement|Procedure|Observation) Part of referenced event --></partOf>

 <context><!-- 0..1 Reference(Encounter|EpisodeOfCare) Encounter / Episode associated with MedicationStatement --></context>
 <status value="[code]"/><!-- 1..1 active | completed | entered-in-error | intended | stopped | on-hold -->
 <category><!-- 0..1 CodeableConcept Type of medication usage --></category>
 <medication[x]><!-- 1..1 CodeableConcept|Reference(Medication) What medication was taken --></medication[x]>
 <effective[x]><!-- 0..1 dateTime|Period The date/time or interval when the medication was taken --></effective[x]>
 <dateAsserted value="[dateTime]"/><!-- 0..1 When the statement was asserted? -->
 <informationSource><!-- 0..1 Reference(Patient|Practitioner|RelatedPerson|
   Organization) Person or organization that provided the information about the taking of this medication --></informationSource>

 <subject><!-- 1..1 Reference(Patient|Group) Who is/was taking  the medication --></subject>
 <derivedFrom><!-- 0..* Reference(Any) Additional supporting information --></derivedFrom>
 <taken value="[code]"/><!-- 1..1 y | n | unk | na -->
 <reasonNotTaken><!-- ?? 0..* CodeableConcept True if asserting medication was not given --></reasonNotTaken>
 <reasonCode><!-- 0..* CodeableConcept Reason for why the medication is being/was taken --></reasonCode>
 <reasonReference><!-- 0..* Reference(Condition|Observation) Condition or observation that supports why the medication is being/was taken --></reasonReference>
 <note><!-- 0..* Annotation Further information about the statement --></note>
 <dosage><!-- 0..* Dosage Details of how medication is/was taken or should be taken --></dosage>

</MedicationStatement>

JSON Template 

{
  "resourceType" : "",

{doco
  "resourceType" : "MedicationStatement",

  // from Resource: id, meta, implicitRules, and language
  // from DomainResource: text, contained, extension, and modifierExtension
  "
  "
  "
  "
  "
  "
  "
  
  " },
  " },
  
  ">",
  " },
  "
  "

  "identifier" : [{ Identifier }], // External identifier
  "basedOn" : [{ Reference(MedicationRequest|CarePlan|ProcedureRequest|
   ReferralRequest) }], // Fulfils plan, proposal or order

  "partOf" : [{ Reference(MedicationAdministration|MedicationDispense|
   MedicationStatement|Procedure|Observation) }], // Part of referenced event

  "context" : { Reference(Encounter|EpisodeOfCare) }, // Encounter / Episode associated with MedicationStatement
  "status" : "<code>", // R!  active | completed | entered-in-error | intended | stopped | on-hold
  "category" : { CodeableConcept }, // Type of medication usage

  // medication[x]: What medication was taken. One of these 2:
  " },
  " },
  "
    "
    "
    
    "<a title="Indicates whether the Medication is only taken when needed within a specific dosing schedule (Boolean option), or it indicates the precondition for taking the Medication (CodeableConcept).  

  "medicationCodeableConcept" : { CodeableConcept },
  "medicationReference" : { Reference(Medication) },
  // effective[x]: The date/time or interval when the medication was taken. One of these 2:

  "effectiveDateTime" : "<dateTime>",
  "effectivePeriod" : { Period },
  "dateAsserted" : "<dateTime>", // When the statement was asserted?
  "informationSource" : { Reference(Patient|Practitioner|RelatedPerson|
   Organization) }, // Person or organization that provided the information about the taking of this medication

  "subject" : { Reference(Patient|Group) }, // R!  Who is/was taking  the medication
  "derivedFrom" : [{ Reference(Any) }], // Additional supporting information
  "taken" : "<code>", // R!  y | n | unk | na
  "reasonNotTaken" : [{ CodeableConcept }], // C? True if asserting medication was not given
  "reasonCode" : [{ CodeableConcept }], // Reason for why the medication is being/was taken
  "reasonReference" : [{ Reference(Condition|Observation) }], // Condition or observation that supports why the medication is being/was taken
  "note" : [{ Annotation }], // Further information about the statement
  "dosage" : [{ Dosage }] // Details of how medication is/was taken or should be taken
}

Turtle Template 


@prefix fhir: <http://hl7.org/fhir/> .doco


Specifically if 'boolean' datatype is selected, then the following logic applies:  If set to True, this indicates that the medication is only taken when needed, within the specified schedule." class="dict" href="medicationstatement-definitions.html#MedicationStatement.dosage.asNeededBoolean">asNeededBoolean>,
    "<a title="Indicates whether the Medication is only taken when needed within a specific dosing schedule (Boolean option), or it indicates the precondition for taking the Medication (CodeableConcept).  


Specifically if 'boolean' datatype is selected, then the following logic applies:  If set to True, this indicates that the medication is only taken when needed, within the specified schedule." class="dict" href="medicationstatement-definitions.html#MedicationStatement.dosage.asNeededCodeableConcept">asNeededCodeableConcept },
    
    " },
    " },
    "
    "
    
    " },
    " },
    
    " },
    " },
    "
  }]
}

[ a fhir:MedicationStatement;
  fhir:nodeRole fhir:treeRoot; # if this is the parser root

  # from Resource: .id, .meta, .implicitRules, and .language
  # from DomainResource: .text, .contained, .extension, and .modifierExtension
  fhir:MedicationStatement.identifier [ Identifier ], ... ; # 0..* External identifier
  fhir:MedicationStatement.basedOn [ Reference(MedicationRequest|CarePlan|ProcedureRequest|ReferralRequest) ], ... ; # 0..* Fulfils plan, proposal or order
  fhir:MedicationStatement.partOf [ Reference(MedicationAdministration|MedicationDispense|MedicationStatement|Procedure|
  Observation) ], ... ; # 0..* Part of referenced event

  fhir:MedicationStatement.context [ Reference(Encounter|EpisodeOfCare) ]; # 0..1 Encounter / Episode associated with MedicationStatement
  fhir:MedicationStatement.status [ code ]; # 1..1 active | completed | entered-in-error | intended | stopped | on-hold
  fhir:MedicationStatement.category [ CodeableConcept ]; # 0..1 Type of medication usage
  # MedicationStatement.medication[x] : 1..1 What medication was taken. One of these 2
    fhir:MedicationStatement.medicationCodeableConcept [ CodeableConcept ]
    fhir:MedicationStatement.medicationReference [ Reference(Medication) ]
  # MedicationStatement.effective[x] : 0..1 The date/time or interval when the medication was taken. One of these 2
    fhir:MedicationStatement.effectiveDateTime [ dateTime ]
    fhir:MedicationStatement.effectivePeriod [ Period ]
  fhir:MedicationStatement.dateAsserted [ dateTime ]; # 0..1 When the statement was asserted?
  fhir:MedicationStatement.informationSource [ Reference(Patient|Practitioner|RelatedPerson|Organization) ]; # 0..1 Person or organization that provided the information about the taking of this medication
  fhir:MedicationStatement.subject [ Reference(Patient|Group) ]; # 1..1 Who is/was taking  the medication
  fhir:MedicationStatement.derivedFrom [ Reference(Any) ], ... ; # 0..* Additional supporting information
  fhir:MedicationStatement.taken [ code ]; # 1..1 y | n | unk | na
  fhir:MedicationStatement.reasonNotTaken [ CodeableConcept ], ... ; # 0..* True if asserting medication was not given
  fhir:MedicationStatement.reasonCode [ CodeableConcept ], ... ; # 0..* Reason for why the medication is being/was taken
  fhir:MedicationStatement.reasonReference [ Reference(Condition|Observation) ], ... ; # 0..* Condition or observation that supports why the medication is being/was taken
  fhir:MedicationStatement.note [ Annotation ], ... ; # 0..* Further information about the statement
  fhir:MedicationStatement.dosage [ Dosage ], ... ; # 0..* Details of how medication is/was taken or should be taken
]

Changes since DSTU2

MedicationStatement
MedicationStatement.basedOn
  • Added Element
MedicationStatement.partOf
  • Added Element
MedicationStatement.context
  • Added Element
MedicationStatement.category
  • Added Element
MedicationStatement.informationSource
  • Add Reference(Organization)
MedicationStatement.subject
  • Renamed from patient to subject
  • Add Reference(Group)
MedicationStatement.derivedFrom
  • Renamed from supportingInformation to derivedFrom
MedicationStatement.taken
  • Added Element
MedicationStatement.reasonCode
  • Added Element
MedicationStatement.reasonReference
  • Added Element
MedicationStatement.note
  • Max Cardinality changed from 1 to *
  • Type changed from string to Annotation
MedicationStatement.dosage
  • Type changed from BackboneElement to Dosage
MedicationStatement.wasNotTaken
  • deleted
MedicationStatement.reasonForUse[x]
  • deleted
MedicationStatement.dosage.text
  • deleted
MedicationStatement.dosage.timing
  • deleted
MedicationStatement.dosage.asNeeded[x]
  • deleted
MedicationStatement.dosage.site[x]
  • deleted
MedicationStatement.dosage.route
  • deleted
MedicationStatement.dosage.method
  • deleted
MedicationStatement.dosage.quantity[x]
  • deleted
MedicationStatement.dosage.rate[x]
  • deleted
MedicationStatement.dosage.maxDosePerPeriod
  • deleted

See the Full Difference for further information

This analysis is available as XML or JSON .

See R2 <--> R3 Conversion Maps (status = 7 tests that all execute ok. All tests pass round-trip testing and 1 r3 resources are invalid (1 errors). ).

Structure

Σ 1..1 Who is/was taking the medication 0..1 When the statement was asserted? ?! boolean True if medication is/was not being taken reasonNotTaken Σ I 0..* True if asserting 0..1 Further information about Σ Additional supporting What medication was taken medicationCodeableConcept CodeableConcept medicationReference Details of how Σ Reported dosage 0..1 When/how often was medication taken asNeededBoolean site[x] Σ 0..1 Where (on body) Σ How Σ 0..1 CodeableConcept Range Σ 0..1 Dose quantity per unit of time rateRatio rateRange Range Σ Maximum dose that was consumed per unit
Name Flags Card. Type Description & Constraints doco
. . MedicationStatement I DomainResource Record of medication being taken by a patient
Reason for use is only permitted if wasNotTaken is false + Reason not taken is only permitted if wasNotTaken Taken is true No
Elements defined in Ancestors: id , meta , implicitRules , language , text , contained , extension , modifierExtension
. . . identifier Σ 0..* Identifier External identifier
. . patient . basedOn Σ 0..* Reference ( Patient MedicationRequest | CarePlan | ProcedureRequest | ReferralRequest ) Fulfils plan, proposal or order
. . informationSource . partOf Σ 0..* Reference ( Patient MedicationAdministration | Practitioner MedicationDispense | RelatedPerson MedicationStatement | Procedure | Observation ) Part of referenced event
. . dateAsserted . context Σ 0..1 dateTime Reference ( Encounter | EpisodeOfCare ) Encounter / Episode associated with MedicationStatement
. . . status ?! Σ 1..1 code active | completed | entered-in-error | intended | stopped | on-hold
MedicationStatementStatus ( Required )
. . wasNotTaken . category Σ 0..1 CodeableConcept Type of medication was not given usage
Reason Medication Not Given Codes MedicationStatementCategory ( Example Preferred )
. . reasonForUse[x] . medication[x] Σ 1..1 What medication was taken
Condition/Problem/Diagnosis SNOMED CT Medication Codes ( Example )
. . . . reasonForUseCodeableConcept medicationCodeableConcept CodeableConcept
. . . reasonForUseReference . medicationReference Reference ( Condition Medication )
. . . effective[x] Σ 0..1 Over what period was The date/time or interval when the medication consumed? was taken
. . . . effectiveDateTime dateTime
. . . . effectivePeriod Period
. . note . dateAsserted Σ 0..1 string dateTime When the statement was asserted?
. . supportingInformation . informationSource 0..* 0..1 Reference ( Any Patient | Practitioner | RelatedPerson | Organization ) Person or organization that provided the information about the taking of this medication
. . medication[x] . subject Σ 1..1 Reference ( Medication ) dosage Patient Σ 0..* BackboneElement | Group ) Who is/was taking the medication was taken
. . text . derivedFrom 0..1 0..* string Reference ( Any ) Additional supporting information
. . timing . taken ?! Σ 1..1 Timing code y | n | unk | na
asNeeded[x] MedicationStatementTaken ( Required Σ 0..1 Take "as needed" (for x) )
. . . reasonNotTaken boolean asNeededCodeableConcept I 0..* CodeableConcept True if asserting medication is/was administered was not given
SNOMED CT Anatomical Structure for Administration Site Drugs not taken/completed Codes ( Example ) siteCodeableConcept CodeableConcept siteReference
Reference ( BodySite )
. . route . reasonCode 0..1 0..* CodeableConcept Reason for why the medication entered the body is being/was taken
SNOMED CT Route Condition/Problem/Diagnosis Codes ( Example )
. . method . reasonReference Technique used to administer medication 0..* quantity[x] Reference ( Condition Σ 0..1 Amount administered in one dose quantityQuantity SimpleQuantity | Observation quantityRange ) Condition or observation that supports why the medication is being/was taken
. . rate[x] . note 0..* Ratio Annotation Further information about the statement
. . maxDosePerPeriod . dosage 0..1 0..* Ratio Dosage Details of time how medication is/was taken or should be taken

doco Documentation for this format

UML Diagram ( Legend )

MedicationStatement ( DomainResource ) External identifier - FHIR will generate its own internal identifiers (probably URLs) which do not need to be explicitly managed by the resource. The identifier here is one that would be used by another non-FHIR system - for example an automated medication pump would provide a record each time it operated; an administration while the patient was off the ward might be made with a different system and entered after the event. Particularly important if these records have to be updated identifier : Identifier [0..*] The person A plan, proposal or animal who is/was taking the medication order that is fulfilled in whole or in part by this event patient basedOn : Reference [1..1] « Patient [0..*] MedicationRequest » | CarePlan | ProcedureRequest | ReferralRequest The person who provided the information about the taking A larger event of which this medication particular event is a component or step informationSource partOf : Reference [0..1] « Patient | Practitioner [0..*] MedicationAdministration | RelatedPerson MedicationDispense | MedicationStatement | Procedure | Observation » The date when the medication statement was asserted by encounter or episode of care that establishes the information source context for this MedicationStatement dateAsserted context : dateTime Reference [0..1] Encounter | EpisodeOfCare A code representing the patient or other source's judgment about the state of the medication used that this statement is about. Generally this will be active or completed (this element modifies the meaning of other elements) status : code [1..1] « A set of codes coded concept indicating the current status of a MedicationStatement. (Strength=Required) MedicationStatementStatus ! » Set this to true if the record is saying that the medication was NOT taken (this element modifies the meaning Indicates where type of other elements) wasNotTaken : boolean [0..1] A code indicating why medication statement and where the medication was not taken is expected to be consumed or administered reasonNotTaken category : CodeableConcept [0..*] « [0..1] A set of codes indicating coded concept identifying where the reason why medication included in the MedicationAdministration medicationstatement is negated. (Strength=Example) expected to be consumed or administered (Strength=Preferred) Reason Medication Not Given MedicationStatementCategory ?? » ? A reason for why Identifies the medication being administered. This is being/was taken either a link to a resource representing the details of the medication or a simple attribute carrying a code that identifies the medication from a known list of medications reasonForUse[x] medication[x] : Type [0..1] « [1..1] CodeableConcept | Reference ( Condition Medication ); Codes A coded concept identifying why the medication is substance or product being taken. (Strength=Example) Condition/Problem/Diagnosis SNOMED CT Medication ?? » The interval of time during which it is being asserted that the patient was taking the medication (or was not taking, when the wasNotGiven element is true) effective[x] : Type [0..1] « dateTime | Period » Provides extra information about The date when the medication statement that is not conveyed was asserted by the other attributes information source note dateAsserted : string dateTime [0..1] Allows linking the MedicationStatement to the underlying MedicationOrder, The person or to other information organization that supports the MedicationStatement supportingInformation : Reference [0..*] « Any » Identifies provided the medication being administered. This is either a link to a resource representing information about the details taking of the medication or a simple attribute carrying this medication. Note: Use derivedFrom when a code that identifies the medication MedicationStatement is derived from a known list of medications other resources, e.g Claim or MedicationRequest medication[x] informationSource : Type [1..1] « CodeableConcept | Reference ( Medication [0..1] Patient ) » Dosage | Practitioner | Free text dosage information as reported about a patient's medication use. When coded dosage information is present, the free text may still be present for display to humans text RelatedPerson : string | Organization [0..1] The timing schedule for giving person, animal or group who is/was taking the medication to the patient. The Schedule data type allows many different expressions, for example. "Every 8 hours"; "Three times a day"; "1/2 an hour before breakfast for 10 days from 23-Dec 2011:"; "15 Oct 2013, 17 Oct 2013 and 1 Nov 2013" timing subject : Timing Reference [1..1] Patient | Group [0..1] Indicates whether the Medication is only taken when needed within a specific dosing schedule (Boolean option), or it indicates the precondition for taking Allows linking the Medication (CodeableConcept). Specifically if 'boolean' datatype is selected, then MedicationStatement to the following logic applies: If set underlying MedicationRequest, or to True, this indicates other information that the medication supports or is only taken when needed, within used to derive the specified schedule MedicationStatement asNeeded[x] derivedFrom : Type [0..1] « boolean Reference | CodeableConcept [0..*] Any » A coded specification Indicator of or a reference to the anatomic site where certainty of whether the medication first enters was taken by the body patient (this element modifies the meaning of other elements) site[x] taken : Type [0..1] « CodeableConcept | Reference ( BodySite code ); [1..1] A coded concept describing the site location the medicine enters into identifying level of certainty if patient has taken or onto has not taken the body. (Strength=Example) medication (Strength=Required) SNOMED CT Anatomical Structur... ?? » MedicationStatementTaken ! A code specifying indicating why the route or physiological path of administration of a therapeutic agent into or onto a subject medication was not taken route reasonNotTaken : CodeableConcept [0..1] « [0..*] A coded concept describing indicating the route or physiological path of administration of a therapeutic agent into or onto reason why the body of a subject. medication was not taken (Strength=Example) SNOMED CT Route Drugs not taken/com... ?? » A coded value indicating the method by which reason for why the medication is intended to be or was introduced into or on the body. This attribute will most often NOT be populated. It is most commonly used for injections. For example, Slow Push, Deep IV being/was taken method reasonCode : CodeableConcept [0..1] [0..*] The amount of therapeutic or other substance given at one administration event A coded concept identifying why the medication is being taken. (Strength=Example) quantity[x] : Type [0..1] « Quantity ( SimpleQuantity )| Range Condition/Problem/Diagnosis » ?? Identifies the speed with which the medication was or will be introduced into the patient. Typically the rate for an infusion e.g. 100 ml per 1 hour Condition or 100 ml/hr. May also be expressed as a rate per unit of time e.g. 500 ml per 2 hours. Currently we do not specify a default of '1' in observation that supports why the denominator, but this medication is being discussed. Other examples: 200 mcg/min or 200 mcg/1 minute; 1 liter/8 hours being/was taken rate[x] reasonReference : Type Reference [0..1] « Ratio [0..*] Condition | Range Observation » The maximum total quantity of a therapeutic substance Provides extra information about the medication statement that may be administered to a subject over is not conveyed by the period of time. For example, 1000mg in 24 hours other attributes maxDosePerPeriod note : Ratio Annotation [0..1] [0..*] Indicates how the medication is/was used or should be taken by the patient dosage : Dosage [0..*]

XML Template 

<

<MedicationStatement xmlns="http://hl7.org/fhir"> doco

 <!-- from Resource: id, meta, implicitRules, and language -->
 <!-- from DomainResource: text, contained, extension, and modifierExtension -->
 <</identifier>
 <</patient>
 <</informationSource>
 <
 <
 <
 <</reasonNotTaken>
 <</reasonForUse[x]>
 <</effective[x]>
 <
 <</supportingInformation>
 <</medication[x]>
 <
  <
  <</timing>
  <<a title="Indicates whether the Medication is only taken when needed within a specific dosing schedule (Boolean option), or it indicates the precondition for taking the Medication (CodeableConcept).  

Specifically if 'boolean' datatype is selected, then the following logic applies:  If set to True, this indicates that the medication is only taken when needed, within the specified schedule." class="dict" href="medicationstatement-definitions.html#MedicationStatement.dosage.asNeeded[x]"></asNeeded[x]>
  <</site[x]>
  <</route>
  <</method>
  <</quantity[x]>
  <</rate[x]>
  <</maxDosePerPeriod>
 </dosage>

 <identifier><!-- 0..* Identifier External identifier --></identifier>
 <basedOn><!-- 0..* Reference(MedicationRequest|CarePlan|ProcedureRequest|
   ReferralRequest) Fulfils plan, proposal or order --></basedOn>

 <partOf><!-- 0..* Reference(MedicationAdministration|MedicationDispense|
   MedicationStatement|Procedure|Observation) Part of referenced event --></partOf>

 <context><!-- 0..1 Reference(Encounter|EpisodeOfCare) Encounter / Episode associated with MedicationStatement --></context>
 <status value="[code]"/><!-- 1..1 active | completed | entered-in-error | intended | stopped | on-hold -->
 <category><!-- 0..1 CodeableConcept Type of medication usage --></category>
 <medication[x]><!-- 1..1 CodeableConcept|Reference(Medication) What medication was taken --></medication[x]>
 <effective[x]><!-- 0..1 dateTime|Period The date/time or interval when the medication was taken --></effective[x]>
 <dateAsserted value="[dateTime]"/><!-- 0..1 When the statement was asserted? -->
 <informationSource><!-- 0..1 Reference(Patient|Practitioner|RelatedPerson|
   Organization) Person or organization that provided the information about the taking of this medication --></informationSource>

 <subject><!-- 1..1 Reference(Patient|Group) Who is/was taking  the medication --></subject>
 <derivedFrom><!-- 0..* Reference(Any) Additional supporting information --></derivedFrom>
 <taken value="[code]"/><!-- 1..1 y | n | unk | na -->
 <reasonNotTaken><!-- ?? 0..* CodeableConcept True if asserting medication was not given --></reasonNotTaken>
 <reasonCode><!-- 0..* CodeableConcept Reason for why the medication is being/was taken --></reasonCode>
 <reasonReference><!-- 0..* Reference(Condition|Observation) Condition or observation that supports why the medication is being/was taken --></reasonReference>
 <note><!-- 0..* Annotation Further information about the statement --></note>
 <dosage><!-- 0..* Dosage Details of how medication is/was taken or should be taken --></dosage>

</MedicationStatement>

JSON Template 

{
  "resourceType" : "",

{doco
  "resourceType" : "MedicationStatement",

  // from Resource: id, meta, implicitRules, and language
  // from DomainResource: text, contained, extension, and modifierExtension
  "
  "
  "
  "
  "
  "
  "
  
  " },
  " },
  
  ">",
  " },
  "
  "

  "identifier" : [{ Identifier }], // External identifier
  "basedOn" : [{ Reference(MedicationRequest|CarePlan|ProcedureRequest|
   ReferralRequest) }], // Fulfils plan, proposal or order

  "partOf" : [{ Reference(MedicationAdministration|MedicationDispense|
   MedicationStatement|Procedure|Observation) }], // Part of referenced event

  "context" : { Reference(Encounter|EpisodeOfCare) }, // Encounter / Episode associated with MedicationStatement
  "status" : "<code>", // R!  active | completed | entered-in-error | intended | stopped | on-hold
  "category" : { CodeableConcept }, // Type of medication usage

  // medication[x]: What medication was taken. One of these 2:
  " },
  " },
  "
    "
    "
    
    "<a title="Indicates whether the Medication is only taken when needed within a specific dosing schedule (Boolean option), or it indicates the precondition for taking the Medication (CodeableConcept).  

  "medicationCodeableConcept" : { CodeableConcept },
  "medicationReference" : { Reference(Medication) },
  // effective[x]: The date/time or interval when the medication was taken. One of these 2:

  "effectiveDateTime" : "<dateTime>",
  "effectivePeriod" : { Period },
  "dateAsserted" : "<dateTime>", // When the statement was asserted?
  "informationSource" : { Reference(Patient|Practitioner|RelatedPerson|
   Organization) }, // Person or organization that provided the information about the taking of this medication

  "subject" : { Reference(Patient|Group) }, // R!  Who is/was taking  the medication
  "derivedFrom" : [{ Reference(Any) }], // Additional supporting information
  "taken" : "<code>", // R!  y | n | unk | na
  "reasonNotTaken" : [{ CodeableConcept }], // C? True if asserting medication was not given
  "reasonCode" : [{ CodeableConcept }], // Reason for why the medication is being/was taken
  "reasonReference" : [{ Reference(Condition|Observation) }], // Condition or observation that supports why the medication is being/was taken
  "note" : [{ Annotation }], // Further information about the statement
  "dosage" : [{ Dosage }] // Details of how medication is/was taken or should be taken
}

Turtle Template 


@prefix fhir: <http://hl7.org/fhir/> .doco


Specifically if 'boolean' datatype is selected, then the following logic applies:  If set to True, this indicates that the medication is only taken when needed, within the specified schedule." class="dict" href="medicationstatement-definitions.html#MedicationStatement.dosage.asNeededBoolean">asNeededBoolean>,
    "<a title="Indicates whether the Medication is only taken when needed within a specific dosing schedule (Boolean option), or it indicates the precondition for taking the Medication (CodeableConcept).  


Specifically if 'boolean' datatype is selected, then the following logic applies:  If set to True, this indicates that the medication is only taken when needed, within the specified schedule." class="dict" href="medicationstatement-definitions.html#MedicationStatement.dosage.asNeededCodeableConcept">asNeededCodeableConcept },
    
    " },
    " },
    "
    "
    
    " },
    " },
    
    " },
    " },
    "
  }]
}

[ a fhir:MedicationStatement;
  fhir:nodeRole fhir:treeRoot; # if this is the parser root

  # from Resource: .id, .meta, .implicitRules, and .language
  # from DomainResource: .text, .contained, .extension, and .modifierExtension
  fhir:MedicationStatement.identifier [ Identifier ], ... ; # 0..* External identifier
  fhir:MedicationStatement.basedOn [ Reference(MedicationRequest|CarePlan|ProcedureRequest|ReferralRequest) ], ... ; # 0..* Fulfils plan, proposal or order
  fhir:MedicationStatement.partOf [ Reference(MedicationAdministration|MedicationDispense|MedicationStatement|Procedure|
  Observation) ], ... ; # 0..* Part of referenced event

  fhir:MedicationStatement.context [ Reference(Encounter|EpisodeOfCare) ]; # 0..1 Encounter / Episode associated with MedicationStatement
  fhir:MedicationStatement.status [ code ]; # 1..1 active | completed | entered-in-error | intended | stopped | on-hold
  fhir:MedicationStatement.category [ CodeableConcept ]; # 0..1 Type of medication usage
  # MedicationStatement.medication[x] : 1..1 What medication was taken. One of these 2
    fhir:MedicationStatement.medicationCodeableConcept [ CodeableConcept ]
    fhir:MedicationStatement.medicationReference [ Reference(Medication) ]
  # MedicationStatement.effective[x] : 0..1 The date/time or interval when the medication was taken. One of these 2
    fhir:MedicationStatement.effectiveDateTime [ dateTime ]
    fhir:MedicationStatement.effectivePeriod [ Period ]
  fhir:MedicationStatement.dateAsserted [ dateTime ]; # 0..1 When the statement was asserted?
  fhir:MedicationStatement.informationSource [ Reference(Patient|Practitioner|RelatedPerson|Organization) ]; # 0..1 Person or organization that provided the information about the taking of this medication
  fhir:MedicationStatement.subject [ Reference(Patient|Group) ]; # 1..1 Who is/was taking  the medication
  fhir:MedicationStatement.derivedFrom [ Reference(Any) ], ... ; # 0..* Additional supporting information
  fhir:MedicationStatement.taken [ code ]; # 1..1 y | n | unk | na
  fhir:MedicationStatement.reasonNotTaken [ CodeableConcept ], ... ; # 0..* True if asserting medication was not given
  fhir:MedicationStatement.reasonCode [ CodeableConcept ], ... ; # 0..* Reason for why the medication is being/was taken
  fhir:MedicationStatement.reasonReference [ Reference(Condition|Observation) ], ... ; # 0..* Condition or observation that supports why the medication is being/was taken
  fhir:MedicationStatement.note [ Annotation ], ... ; # 0..* Further information about the statement
  fhir:MedicationStatement.dosage [ Dosage ], ... ; # 0..* Details of how medication is/was taken or should be taken
]

Changes since DSTU2

MedicationStatement
MedicationStatement.basedOn
  • Added Element
MedicationStatement.partOf
  • Added Element
MedicationStatement.context
  • Added Element
MedicationStatement.category
  • Added Element
MedicationStatement.informationSource
  • Add Reference(Organization)
MedicationStatement.subject
  • Renamed from patient to subject
  • Add Reference(Group)
MedicationStatement.derivedFrom
  • Renamed from supportingInformation to derivedFrom
MedicationStatement.taken
  • Added Element
MedicationStatement.reasonCode
  • Added Element
MedicationStatement.reasonReference
  • Added Element
MedicationStatement.note
  • Max Cardinality changed from 1 to *
  • Type changed from string to Annotation
MedicationStatement.dosage
  • Type changed from BackboneElement to Dosage
MedicationStatement.wasNotTaken
  • deleted
MedicationStatement.reasonForUse[x]
  • deleted
MedicationStatement.dosage.text
  • deleted
MedicationStatement.dosage.timing
  • deleted
MedicationStatement.dosage.asNeeded[x]
  • deleted
MedicationStatement.dosage.site[x]
  • deleted
MedicationStatement.dosage.route
  • deleted
MedicationStatement.dosage.method
  • deleted
MedicationStatement.dosage.quantity[x]
  • deleted
MedicationStatement.dosage.rate[x]
  • deleted
MedicationStatement.dosage.maxDosePerPeriod
  • deleted

See the Full Difference for further information

This analysis is available as XML or JSON .

See R2 <--> R3 Conversion Maps (status = 7 tests that all execute ok. All tests pass round-trip testing and 1 r3 resources are invalid (1 errors). ).

   

Alternate definitions: Schema / Schematron , Resource Profile Master Definition ( XML , JSON ), Questionnaire XML Schema / Schematron (for ) + JSON Schema , ShEx (for Turtle )

4.16.3.1 11.4.3.1 Terminology Bindings

MedicationStatement.reasonNotTaken MedicationStatement.reasonForUse[x] MedicationStatement.dosage.asNeeded[x] MedicationStatement.dosage.site[x] MedicationStatement.dosage.route MedicationStatement.dosage.method A coded concept describing the technique by which the medicine is administered. Unknown No details provided yet
Path Definition Type Reference
MedicationStatement.status A set of codes coded concept indicating the current status of a MedicationStatement. Required MedicationStatementStatus
MedicationStatement.category A set of codes indicating coded concept identifying where the reason why medication included in the MedicationAdministration medicationstatement is negated. expected to be consumed or administered Example Preferred Reason Medication Not Given Codes MedicationStatementCategory
MedicationStatement.medication[x] Codes A coded concept identifying why the medication is substance or product being taken. Example Condition/Problem/Diagnosis SNOMED CT Medication Codes
MedicationStatement.taken A coded concept identifying the precondition that should be met or evaluated prior to consuming level of certainty if patient has taken or administering a has not taken the medication dose. For example "pain", "30 minutes prior to sexual intercourse", "on flare-up" etc. Unknown Required No details provided yet MedicationStatementTaken
MedicationStatement.reasonNotTaken A coded concept describing the site location indicating the medicine enters into or onto reason why the body. medication was not taken Example SNOMED CT Anatomical Structure for Administration Site Drugs not taken/completed Codes
MedicationStatement.reasonCode A coded concept describing the route or physiological path of administration of a therapeutic agent into or onto identifying why the body of a subject. medication is being taken. Example SNOMED CT Route Condition/Problem/Diagnosis Codes

4.16.3.2 11.4.3.2 Constraints

  • mst-1 : Reason not taken is only permitted if wasNotTaken Taken is true (xpath: No ( expression : not(exists(f:reasonNotTaken) and f:wasNotTaken/@value=false()) reasonNotTaken.exists().not() or (taken = 'n') )

mst-2 : Reason 11.4.3.3 How to determine if the patient has taken the medication

The MedicationStatement resource includes both a status and a taken code. The taken code conveys whether the medication was taken by the patient from the perspective of the information source. The status code reflects the current state of the practitioner’s instructions to the patient whether the consumption of the medication should continue or not.

Note: Medication statements can be made about prescribed medications as well as non-prescribed (i.e. over the counter) medications.

If you desire to perform a query for all medication statements that “imply” that a medication has been taken, you will need to use both MedicationStatement.status and MedicationStatement.taken in your query. The following table is only permitted if wasNotTaken intended to provide guidance on the interpretation of these two attributes with respect to the MedicationStatement.

In the table below the “X” represents a valid status that can be present in combination with the Taken value.

Taken Information Source Active Completed Stopped On Hold Entered in Error Intended Interpretation or Meaning
N Exists (e.g. Patient or RelatedPerson) X X X Patient or related person states the medication is false (xpath: not(exists(*[starts-with(local-name(.), 'reasonForUse')]) not currently being taken. Taken must = N.
When status = Active, it means that although a statement was made that the patient isn’t taking the medication, the practitioner still expects and f:wasNotTaken/@value=true()) ) instructs the patient to take the medication.
When status = On Hold, it means that although a statement was made that the patient isn’t taking the medication, the practitioner has suspended the medication, but intends for the patient to take the medication in the future.
When status = Intended, it means that although a statement was made that the patient isn’t taking the medication, the practitioner intends for the patient to take the medication in the future.
Y Exists (e.g. Patient or RelatedPerson) X X X Patient or related person states the medication is or will be taken. Taken must = Y. The status values can be any of the following: active, on hold, or intended.
UNK No information source exists X X X No assertion by patient or related person of whether the medication is being consumed.
The MedicationStatement still exists because it can be derived from a MedicationRequest, but it is unknown whether the Patient is taking the medication as prescribed in the MedicationRequest.
NA No information source exists X X X X X X Patient reporting does not apply.
For example, this can occur when MedicationStatements are derived from MedicationRequests that are administered by a practitioner. In this example, there is no need to ask for input from the patient or related person since the practitioner was responsible for the administration.
Another example might be a MedicationStatement derived from an end-stated (stopped, completed, entered in error) MedicationRequest. In this example, there is no need to ask for input from the patient or related person since the MedicationRequest is no longer applicable.

4.16.4 11.4.4 Search Parameters

Search parameters for this resource. The common parameters also apply. See Searching for more information about searching in REST, messaging, and services.

Name Type Description Paths Expression In Common
category token Returns statements of this category of medicationstatement MedicationStatement.category
code token Return administrations statements of this medication code MedicationStatement.medicationCodeableConcept MedicationStatement.medication.as(CodeableConcept) 4 Resources
effectivedate context reference Returns statements for a specific context (episode or episode of Care). MedicationStatement.context
( EpisodeOfCare , Encounter )
effective date Date when patient was taking (or not taking) the medication MedicationStatement.effective[x] MedicationStatement.effective
identifier token Return statements with this external identifier MedicationStatement.identifier 3 Resources
medication reference Return administrations statements of this medication reference MedicationStatement.medicationReference MedicationStatement.medication.as(Reference)
( Medication ) 		3 Resources
patient part-of reference The identity Returns statements that are part of a another event. MedicationStatement.partOf
( MedicationDispense , Observation , MedicationAdministration , Procedure , MedicationStatement )
patient to list reference Returns statements for a specific patient. MedicationStatement.patient MedicationStatement.subject
( Patient ) 		3 Resources
source reference Who or where the information in the statement came from MedicationStatement.informationSource
( Patient , Practitioner , Organization , Patient , RelatedPerson )
status token Return statements that match the given status MedicationStatement.status 3 Resources
subject reference The identity of a patient, animal or group to list statements for MedicationStatement.subject
( Group , Patient )