Release 4 5

This page is part of the FHIR Specification (v4.0.1: R4 (v5.0.0: R5 - Mixed Normative and STU ) ). This is the current published version in it's permanent home (it will always be available at this URL). 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

Library-opioidcds-common

Example Library/opioidcds-common (Narrative)

Clinical Decision Support Work Group Maturity Level : N/A Standards Status : Informative Compartments : Not linked to any No defined compartments

This is the narrative for the resource. See also the XML , JSON or Turtle format. This example conforms to the profile Library .

Generated Narrative with Details id : opioidcds-common identifier : OpioidCDS_Common (OFFICIAL) version : 0.1.0 title : Opioid CDS Common Logic status : active experimental : false type : Logic Library (Details : {http://terminology.hl7.org/CodeSystem/library-type code 'logic-library' = 'Logic Library', given as 'Logic Library'}) date : 25/03/2018 1:49:09 PM publisher : Centers for Disease Control and Prevention (CDC) description : Common Opioid Decision Support Logic for use in implementing CDC Opioid Prescribing Guidelines. useContext : , jurisdiction : United States of America (Details : {urn:iso:std:iso:3166 code 'US' = 'United States of America', given as 'United States of America'}) purpose : This library contains common logic across recommendations including MME calculations, conversions, and looking up codes in valuesets. usage : This library is used for decision support for opioid guideline recommendations when applying PlanDefinitions. copyright : © CDC 2016+. topic : Opioid Prescribing (Details ) author : , , , relatedArtifact : , ,

Participants

AuthorKensaku Kawamoto, MD, PhD, MHS
AuthorBryn Rhodes
AuthorFloyd Eisenberg, MD, MPH
AuthorRobert McClure, MD, MPH

Related Artifacts

DocumentationCDC guideline for prescribing opioids for chronic pain

https://guidelines.gov/summaries/summary/50153/cdc-guideline-for-prescribing-opioids-for-chronic-pain---united-states-2016#420 ()

Depends Onhttp://example.org/fhir/Library/omtk-logic
DocumentationMME Conversion Tables

https://www.cdc.gov/drugoverdose/pdf/calculating_total_daily_dose-a.pdf ()

Contents

application/elm+xml

<?xml version="1.0" encoding="UTF-8"?>
<library xmlns="urn:hl7-org:elm:r1" xmlns:t="urn:hl7-org:elm-types:r1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:fhir="http://hl7.org/fhir" xmlns:qdm43="urn:healthit-gov:qdm:v4_3" xmlns:qdm53="urn:healthit-gov:qdm:v5_3" xmlns:a="urn:hl7-org:cql-annotations:r1">
   <identifier id="OpioidCDS_STU4_Common" version="0.1.0"/>
   <schemaIdentifier id="urn:hl7-org:elm" version="r1"/>
   <usings>
      <def localIdentifier="System" uri="urn:hl7-org:elm-types:r1"/>
      <def localIdentifier="FHIR" uri="http://hl7.org/fhir" version="3.2.0"/>
   </usings>
   <includes>
      <def localIdentifier="OMTKLogic" path="OMTKLogic" version="0.1.0"/>
   </includes>
   <valueSets>
      <def name="Benzodiazepines" id="benzodiazepines" accessLevel="Public"/>
      <def name="Naloxone" id="naloxone" accessLevel="Public"/>
      <def name="Ambulatory Abuse Potential Opioids" id="opioids-abused-in-ambulatory-care" accessLevel="Public"/>
      <def name="End Of Life Opioids" id="opioids-indicating-end-of-life" accessLevel="Public"/>
      <def name="Long Acting Opioids" id="long-acting-opioids" accessLevel="Public"/>
      <def name="Illicit Drug Screening" id="illicit-drug-urine-screening" accessLevel="Public"/>
      <def name="Opioid Drug Screening" id="opioid-urine-screening" accessLevel="Public"/>
      <def name="Opioids" id="opioids" accessLevel="Public"/>
      <def name="Codeine Cough Meds" id="opioids-codeine-cough-meds" accessLevel="Public"/>
      <def name="Short Acting Opioids" id="short-acting-opioids" accessLevel="Public"/>
   </valueSets>
   <statements>
      <def name="IsForChronicPain" context="Patient" accessLevel="Public">
         <expression valueType="t:Boolean" value="true" xsi:type="Literal"/>
      </def>
      <def name="HasMetastaticCancer" context="Patient" accessLevel="Public">
         <expression valueType="t:Boolean" value="false" xsi:type="Literal"/>
      </def>
      <def name="ToCode" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression classType="t:Code" xsi:type="Instance">
            <element name="code">
               <value path="value" xsi:type="Property">
                  <source path="code" xsi:type="Property">
                     <source name="coding" xsi:type="OperandRef"/>
                  </source>
               </value>
            </element>
            <element name="system">
               <value path="value" xsi:type="Property">
                  <source path="system" xsi:type="Property">
                     <source name="coding" xsi:type="OperandRef"/>
                  </source>
               </value>
            </element>
            <element name="version">
               <value path="value" xsi:type="Property">
                  <source path="version" xsi:type="Property">
                     <source name="coding" xsi:type="OperandRef"/>
                  </source>
               </value>
            </element>
            <element name="display">
               <value path="value" xsi:type="Property">
                  <source path="display" xsi:type="Property">
                     <source name="coding" xsi:type="OperandRef"/>
                  </source>
               </value>
            </element>
         </expression>
         <operand name="coding">
            <operandTypeSpecifier name="fhir:Coding" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="ToQuantity" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression classType="t:Quantity" xsi:type="Instance">
            <element name="value">
               <value path="value" xsi:type="Property">
                  <source path="value" xsi:type="Property">
                     <source name="quantity" xsi:type="OperandRef"/>
                  </source>
               </value>
            </element>
            <element name="unit">
               <value path="value" xsi:type="Property">
                  <source path="unit" xsi:type="Property">
                     <source name="quantity" xsi:type="OperandRef"/>
                  </source>
               </value>
            </element>
         </expression>
         <operand name="quantity">
            <operandTypeSpecifier name="fhir:Quantity" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="Prescriptions" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="Query">
            <source alias="O">
               <expression name="Orders" xsi:type="OperandRef"/>
            </source>
            <let identifier="rxNormCode">
               <expression name="ToCode" xsi:type="FunctionRef">
                  <operand xsi:type="Indexer">
                     <operand path="coding" xsi:type="Property">
                        <source path="medication" scope="O" xsi:type="Property"/>
                     </operand>
                     <operand valueType="t:Integer" value="0" xsi:type="Literal"/>
                  </operand>
               </expression>
            </let>
            <let identifier="medicationName">
               <expression name="GetMedicationName" libraryName="OMTKLogic" xsi:type="FunctionRef">
                  <operand name="rxNormCode" xsi:type="QueryLetRef"/>
               </expression>
            </let>
            <let identifier="dosageInstruction">
               <expression xsi:type="Indexer">
                  <operand path="dosageInstruction" scope="O" xsi:type="Property"/>
                  <operand valueType="t:Integer" value="0" xsi:type="Literal"/>
               </expression>
            </let>
            <let identifier="repeat">
               <expression path="repeat" xsi:type="Property">
                  <source path="timing" xsi:type="Property">
                     <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                  </source>
               </expression>
            </let>
            <let identifier="frequency">
               <expression xsi:type="Coalesce">
                  <operand path="value" xsi:type="Property">
                     <source path="frequencyMax" xsi:type="Property">
                        <source name="repeat" xsi:type="QueryLetRef"/>
                     </source>
                  </operand>
                  <operand path="value" xsi:type="Property">
                     <source path="frequency" xsi:type="Property">
                        <source name="repeat" xsi:type="QueryLetRef"/>
                     </source>
                  </operand>
               </expression>
            </let>
            <let identifier="period">
               <expression classType="t:Quantity" xsi:type="Instance">
                  <element name="value">
                     <value path="value" xsi:type="Property">
                        <source path="period" xsi:type="Property">
                           <source name="repeat" xsi:type="QueryLetRef"/>
                        </source>
                     </value>
                  </element>
                  <element name="unit">
                     <value path="value" xsi:type="Property">
                        <source path="periodUnit" xsi:type="Property">
                           <source name="repeat" xsi:type="QueryLetRef"/>
                        </source>
                     </value>
                  </element>
               </expression>
            </let>
            <let identifier="doseDescription">
               <expression xsi:type="Coalesce">
                  <operand xsi:type="ToList">
                     <operand xsi:type="If">
                        <condition asType="t:Boolean" xsi:type="As">
                           <operand xsi:type="Is">
                              <operand path="dose" xsi:type="Property">
                                 <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                              </operand>
                              <isTypeSpecifier name="fhir:Range" xsi:type="NamedTypeSpecifier"/>
                           </operand>
                        </condition>
                        <then xsi:type="Concatenate">
                           <operand xsi:type="Concatenate">
                              <operand xsi:type="Concatenate">
                                 <operand xsi:type="ToString">
                                    <operand name="ToQuantity" xsi:type="FunctionRef">
                                       <operand path="low" xsi:type="Property">
                                          <source path="dose" xsi:type="Property">
                                             <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                                          </source>
                                       </operand>
                                    </operand>
                                 </operand>
                                 <operand valueType="t:String" value="-" xsi:type="Literal"/>
                              </operand>
                              <operand xsi:type="ToString">
                                 <operand name="ToQuantity" xsi:type="FunctionRef">
                                    <operand path="high" xsi:type="Property">
                                       <source path="dose" xsi:type="Property">
                                          <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                                       </source>
                                    </operand>
                                 </operand>
                              </operand>
                           </operand>
                           <operand path="value" xsi:type="Property">
                              <source path="unit" xsi:type="Property">
                                 <source path="high" xsi:type="Property">
                                    <source path="dose" xsi:type="Property">
                                       <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                                    </source>
                                 </source>
                              </source>
                           </operand>
                        </then>
                        <else xsi:type="ToString">
                           <operand name="ToQuantity" xsi:type="FunctionRef">
                              <operand asType="fhir:Quantity" xsi:type="As">
                                 <operand path="dose" xsi:type="Property">
                                    <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                                 </operand>
                              </operand>
                           </operand>
                        </else>
                     </operand>
                  </operand>
               </expression>
            </let>
            <let identifier="frequencyDescription">
               <expression xsi:type="Concatenate">
                  <operand xsi:type="ToString">
                     <operand path="value" xsi:type="Property">
                        <source path="frequency" xsi:type="Property">
                           <source path="repeat" xsi:type="Property">
                              <source path="timing" xsi:type="Property">
                                 <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                              </source>
                           </source>
                        </source>
                     </operand>
                  </operand>
                  <operand xsi:type="Coalesce">
                     <operand xsi:type="Concatenate">
                        <operand valueType="t:String" value="-" xsi:type="Literal"/>
                        <operand xsi:type="ToString">
                           <operand path="value" xsi:type="Property">
                              <source path="frequencyMax" xsi:type="Property">
                                 <source path="repeat" xsi:type="Property">
                                    <source path="timing" xsi:type="Property">
                                       <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                                    </source>
                                 </source>
                              </source>
                           </operand>
                        </operand>
                     </operand>
                     <operand valueType="t:String" value="" xsi:type="Literal"/>
                  </operand>
               </expression>
            </let>
            <return>
               <expression xsi:type="Tuple">
                  <element name="rxNormCode">
                     <value name="rxNormCode" xsi:type="QueryLetRef"/>
                  </element>
                  <element name="isDraft">
                     <value xsi:type="Equal">
                        <operand path="value" xsi:type="Property">
                           <source path="status" scope="O" xsi:type="Property"/>
                        </operand>
                        <operand valueType="t:String" value="draft" xsi:type="Literal"/>
                     </value>
                  </element>
                  <element name="isPRN">
                     <value path="value" xsi:type="Property">
                        <source path="asNeeded" xsi:type="Property">
                           <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                        </source>
                     </value>
                  </element>
                  <element name="prescription">
                     <value xsi:type="If">
                        <condition asType="t:Boolean" xsi:type="As">
                           <operand xsi:type="Not">
                              <operand xsi:type="IsNull">
                                 <operand path="text" xsi:type="Property">
                                    <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                                 </operand>
                              </operand>
                           </operand>
                        </condition>
                        <then xsi:type="Concatenate">
                           <operand xsi:type="Concatenate">
                              <operand name="medicationName" xsi:type="QueryLetRef"/>
                              <operand valueType="t:String" value=" " xsi:type="Literal"/>
                           </operand>
                           <operand path="value" xsi:type="Property">
                              <source path="text" xsi:type="Property">
                                 <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                              </source>
                           </operand>
                        </then>
                        <else xsi:type="Concatenate">
                           <operand xsi:type="Concatenate">
                              <operand xsi:type="Concatenate">
                                 <operand xsi:type="Concatenate">
                                    <operand xsi:type="Concatenate">
                                       <operand name="medicationName" xsi:type="QueryLetRef"/>
                                       <operand valueType="t:String" value=" " xsi:type="Literal"/>
                                    </operand>
                                    <operand name="doseDescription" xsi:type="QueryLetRef"/>
                                 </operand>
                                 <operand valueType="t:String" value=" q" xsi:type="Literal"/>
                              </operand>
                              <operand name="frequencyDescription" xsi:type="QueryLetRef"/>
                           </operand>
                           <operand xsi:type="If">
                              <condition asType="t:Boolean" xsi:type="As">
                                 <operand path="value" xsi:type="Property">
                                    <source path="asNeeded" xsi:type="Property">
                                       <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                                    </source>
                                 </operand>
                              </condition>
                              <then valueType="t:String" value=" PRN" xsi:type="Literal"/>
                              <else valueType="t:String" value="" xsi:type="Literal"/>
                           </operand>
                        </else>
                     </value>
                  </element>
                  <element name="dose">
                     <value xsi:type="If">
                        <condition asType="t:Boolean" xsi:type="As">
                           <operand xsi:type="Is">
                              <operand path="dose" xsi:type="Property">
                                 <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                              </operand>
                              <isTypeSpecifier name="fhir:Range" xsi:type="NamedTypeSpecifier"/>
                           </operand>
                        </condition>
                        <then name="ToQuantity" xsi:type="FunctionRef">
                           <operand path="high" xsi:type="Property">
                              <source path="dose" xsi:type="Property">
                                 <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                              </source>
                           </operand>
                        </then>
                        <else name="ToQuantity" xsi:type="FunctionRef">
                           <operand asType="fhir:Quantity" xsi:type="As">
                              <operand path="dose" xsi:type="Property">
                                 <source name="dosageInstruction" xsi:type="QueryLetRef"/>
                              </operand>
                           </operand>
                        </else>
                     </value>
                  </element>
                  <element name="dosesPerDay">
                     <value xsi:type="Coalesce">
                        <operand name="ToDaily" libraryName="OMTKLogic" xsi:type="FunctionRef">
                           <operand name="frequency" xsi:type="QueryLetRef"/>
                           <operand name="period" xsi:type="QueryLetRef"/>
                        </operand>
                        <operand valueType="t:Decimal" value="1.0" xsi:type="Literal"/>
                     </value>
                  </element>
               </expression>
            </return>
         </expression>
         <operand name="Orders">
            <operandTypeSpecifier xsi:type="ListTypeSpecifier">
               <elementType name="fhir:MedicationRequest" xsi:type="NamedTypeSpecifier"/>
            </operandTypeSpecifier>
         </operand>
      </def>
      <def name="MME" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="Query">
            <source alias="P">
               <expression name="Prescriptions" xsi:type="FunctionRef">
                  <operand name="prescriptions" xsi:type="OperandRef"/>
               </expression>
            </source>
            <let identifier="mme">
               <expression xsi:type="SingletonFrom">
                  <operand name="CalculateMMEs" libraryName="OMTKLogic" xsi:type="FunctionRef">
                     <operand xsi:type="List">
                        <element xsi:type="Tuple">
                           <element name="rxNormCode">
                              <value path="rxNormCode" scope="P" xsi:type="Property"/>
                           </element>
                           <element name="doseQuantity">
                              <value path="dose" scope="P" xsi:type="Property"/>
                           </element>
                           <element name="dosesPerDay">
                              <value path="dosesPerDay" scope="P" xsi:type="Property"/>
                           </element>
                        </element>
                     </operand>
                  </operand>
               </expression>
            </let>
            <return>
               <expression xsi:type="Tuple">
                  <element name="rxNormCode">
                     <value path="rxNormCode" scope="P" xsi:type="Property"/>
                  </element>
                  <element name="isDraft">
                     <value path="isDraft" scope="P" xsi:type="Property"/>
                  </element>
                  <element name="isPRN">
                     <value path="isPRN" scope="P" xsi:type="Property"/>
                  </element>
                  <element name="prescription">
                     <value path="prescription" scope="P" xsi:type="Property"/>
                  </element>
                  <element name="dailyDose">
                     <value path="dailyDoseDescription" xsi:type="Property">
                        <source name="mme" xsi:type="QueryLetRef"/>
                     </value>
                  </element>
                  <element name="conversionFactor">
                     <value path="conversionFactor" xsi:type="Property">
                        <source name="mme" xsi:type="QueryLetRef"/>
                     </value>
                  </element>
                  <element name="mme">
                     <value path="mme" xsi:type="Property">
                        <source name="mme" xsi:type="QueryLetRef"/>
                     </value>
                  </element>
               </expression>
            </return>
         </expression>
         <operand name="prescriptions">
            <operandTypeSpecifier xsi:type="ListTypeSpecifier">
               <elementType name="fhir:MedicationRequest" xsi:type="NamedTypeSpecifier"/>
            </operandTypeSpecifier>
         </operand>
      </def>
      <def name="TotalMME" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression classType="t:Quantity" xsi:type="Instance">
            <element name="value">
               <value xsi:type="Sum">
                  <source xsi:type="Query">
                     <source alias="M">
                        <expression name="MME" xsi:type="FunctionRef">
                           <operand name="prescriptions" xsi:type="OperandRef"/>
                        </expression>
                     </source>
                     <return>
                        <expression path="value" xsi:type="Property">
                           <source path="mme" scope="M" xsi:type="Property"/>
                        </expression>
                     </return>
                  </source>
               </value>
            </element>
            <element name="unit">
               <value valueType="t:String" value="mg/d" xsi:type="Literal"/>
            </element>
         </expression>
         <operand name="prescriptions">
            <operandTypeSpecifier xsi:type="ListTypeSpecifier">
               <elementType name="fhir:MedicationRequest" xsi:type="NamedTypeSpecifier"/>
            </operandTypeSpecifier>
         </operand>
      </def>
      <def name="GetPeriodDays" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="Case">
            <caseItem>
               <when xsi:type="StartsWith">
                  <operand name="value" xsi:type="OperandRef"/>
                  <operand valueType="t:String" value="year" xsi:type="Literal"/>
               </when>
               <then valueType="t:Decimal" value="365.0" xsi:type="Literal"/>
            </caseItem>
            <caseItem>
               <when xsi:type="StartsWith">
                  <operand name="value" xsi:type="OperandRef"/>
                  <operand valueType="t:String" value="month" xsi:type="Literal"/>
               </when>
               <then valueType="t:Decimal" value="30.0" xsi:type="Literal"/>
            </caseItem>
            <caseItem>
               <when xsi:type="StartsWith">
                  <operand name="value" xsi:type="OperandRef"/>
                  <operand valueType="t:String" value="hour" xsi:type="Literal"/>
               </when>
               <then xsi:type="Divide">
                  <operand valueType="t:Decimal" value="1.0" xsi:type="Literal"/>
                  <operand valueType="t:Decimal" value="24.0" xsi:type="Literal"/>
               </then>
            </caseItem>
            <caseItem>
               <when xsi:type="StartsWith">
                  <operand name="value" xsi:type="OperandRef"/>
                  <operand valueType="t:String" value="minute" xsi:type="Literal"/>
               </when>
               <then xsi:type="Multiply">
                  <operand xsi:type="Divide">
                     <operand valueType="t:Decimal" value="1.0" xsi:type="Literal"/>
                     <operand valueType="t:Decimal" value="24.0" xsi:type="Literal"/>
                  </operand>
                  <operand valueType="t:Decimal" value="60.0" xsi:type="Literal"/>
               </then>
            </caseItem>
            <else valueType="t:Decimal" value="1.0" xsi:type="Literal"/>
         </expression>
         <operand name="value">
            <operandTypeSpecifier name="t:String" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="GetDurationInDays" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="Case">
            <caseItem>
               <when xsi:type="StartsWith">
                  <operand path="value" xsi:type="Property">
                     <source path="unit" xsi:type="Property">
                        <source name="value" xsi:type="OperandRef"/>
                     </source>
                  </operand>
                  <operand valueType="t:String" value="year" xsi:type="Literal"/>
               </when>
               <then xsi:type="Multiply">
                  <operand path="value" xsi:type="Property">
                     <source path="value" xsi:type="Property">
                        <source name="value" xsi:type="OperandRef"/>
                     </source>
                  </operand>
                  <operand valueType="t:Decimal" value="365.0" xsi:type="Literal"/>
               </then>
            </caseItem>
            <caseItem>
               <when xsi:type="StartsWith">
                  <operand path="value" xsi:type="Property">
                     <source path="unit" xsi:type="Property">
                        <source name="value" xsi:type="OperandRef"/>
                     </source>
                  </operand>
                  <operand valueType="t:String" value="month" xsi:type="Literal"/>
               </when>
               <then xsi:type="Multiply">
                  <operand path="value" xsi:type="Property">
                     <source path="value" xsi:type="Property">
                        <source name="value" xsi:type="OperandRef"/>
                     </source>
                  </operand>
                  <operand valueType="t:Decimal" value="30.0" xsi:type="Literal"/>
               </then>
            </caseItem>
            <else path="value" xsi:type="Property">
               <source path="value" xsi:type="Property">
                  <source name="value" xsi:type="OperandRef"/>
               </source>
            </else>
         </expression>
         <operand name="value">
            <operandTypeSpecifier name="fhir:Duration" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="ProbableDaysInRange" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="Query">
            <source alias="orders">
               <expression name="Orders" xsi:type="OperandRef"/>
            </source>
            <let identifier="frequency">
               <expression path="value" xsi:type="Property">
                  <source path="frequency" xsi:type="Property">
                     <source path="repeat" xsi:type="Property">
                        <source path="timing" xsi:type="Property">
                           <source xsi:type="Indexer">
                              <operand path="dosageInstruction" scope="orders" xsi:type="Property"/>
                              <operand valueType="t:Integer" value="0" xsi:type="Literal"/>
                           </source>
                        </source>
                     </source>
                  </source>
               </expression>
            </let>
            <let identifier="period">
               <expression path="value" xsi:type="Property">
                  <source path="period" xsi:type="Property">
                     <source path="repeat" xsi:type="Property">
                        <source path="timing" xsi:type="Property">
                           <source xsi:type="Indexer">
                              <operand path="dosageInstruction" scope="orders" xsi:type="Property"/>
                              <operand valueType="t:Integer" value="0" xsi:type="Literal"/>
                           </source>
                        </source>
                     </source>
                  </source>
               </expression>
            </let>
            <let identifier="periodDays">
               <expression name="GetPeriodDays" xsi:type="FunctionRef">
                  <operand path="value" xsi:type="Property">
                     <source path="periodUnit" xsi:type="Property">
                        <source path="repeat" xsi:type="Property">
                           <source path="timing" xsi:type="Property">
                              <source xsi:type="Indexer">
                                 <operand path="dosageInstruction" scope="orders" xsi:type="Property"/>
                                 <operand valueType="t:Integer" value="0" xsi:type="Literal"/>
                              </source>
                           </source>
                        </source>
                     </source>
                  </operand>
               </expression>
            </let>
            <let identifier="dosesPerDay">
               <expression xsi:type="If">
                  <condition asType="t:Boolean" xsi:type="As">
                     <operand xsi:type="GreaterOrEqual">
                        <operand xsi:type="Divide">
                           <operand xsi:type="ToDecimal">
                              <operand name="frequency" xsi:type="QueryLetRef"/>
                           </operand>
                           <operand xsi:type="Multiply">
                              <operand name="period" xsi:type="QueryLetRef"/>
                              <operand name="periodDays" xsi:type="QueryLetRef"/>
                           </operand>
                        </operand>
                        <operand valueType="t:Decimal" value="1.0" xsi:type="Literal"/>
                     </operand>
                  </condition>
                  <then valueType="t:Decimal" value="1.0" xsi:type="Literal"/>
                  <else xsi:type="Divide">
                     <operand xsi:type="ToDecimal">
                        <operand name="frequency" xsi:type="QueryLetRef"/>
                     </operand>
                     <operand xsi:type="Multiply">
                        <operand name="period" xsi:type="QueryLetRef"/>
                        <operand name="periodDays" xsi:type="QueryLetRef"/>
                     </operand>
                  </else>
               </expression>
            </let>
            <let identifier="repeat">
               <expression path="value" xsi:type="Property">
                  <source path="numberOfRepeatsAllowed" xsi:type="Property">
                     <source path="dispenseRequest" scope="orders" xsi:type="Property"/>
                  </source>
               </expression>
            </let>
            <let identifier="supplyDuration">
               <expression name="GetDurationInDays" xsi:type="FunctionRef">
                  <operand path="expectedSupplyDuration" xsi:type="Property">
                     <source path="dispenseRequest" scope="orders" xsi:type="Property"/>
                  </operand>
               </expression>
            </let>
            <let identifier="validityPeriod">
               <expression precision="Day" xsi:type="DurationBetween">
                  <operand path="value" xsi:type="Property">
                     <source path="start" xsi:type="Property">
                        <source path="validityPeriod" xsi:type="Property">
                           <source path="dispenseRequest" scope="orders" xsi:type="Property"/>
                        </source>
                     </source>
                  </operand>
                  <operand xsi:type="Today"/>
               </expression>
            </let>
            <let identifier="endDifference">
               <expression xsi:type="If">
                  <condition asType="t:Boolean" xsi:type="As">
                     <operand xsi:type="Less">
                        <operand path="value" xsi:type="Property">
                           <source path="end" xsi:type="Property">
                              <source path="validityPeriod" xsi:type="Property">
                                 <source path="dispenseRequest" scope="orders" xsi:type="Property"/>
                              </source>
                           </source>
                        </operand>
                        <operand xsi:type="Today"/>
                     </operand>
                  </condition>
                  <then precision="Day" xsi:type="DurationBetween">
                     <operand path="value" xsi:type="Property">
                        <source path="end" xsi:type="Property">
                           <source path="validityPeriod" xsi:type="Property">
                              <source path="dispenseRequest" scope="orders" xsi:type="Property"/>
                           </source>
                        </source>
                     </operand>
                     <operand xsi:type="Today"/>
                  </then>
                  <else valueType="t:Integer" value="0" xsi:type="Literal"/>
               </expression>
            </let>
            <return>
               <expression xsi:type="GreaterOrEqual">
                  <operand xsi:type="Multiply">
                     <operand xsi:type="Multiply">
                        <operand name="dosesPerDay" xsi:type="QueryLetRef"/>
                        <operand xsi:type="Divide">
                           <operand xsi:type="Multiply">
                              <operand xsi:type="ToDecimal">
                                 <operand name="repeat" xsi:type="QueryLetRef"/>
                              </operand>
                              <operand name="supplyDuration" xsi:type="QueryLetRef"/>
                           </operand>
                           <operand xsi:type="ToDecimal">
                              <operand name="validityPeriod" xsi:type="QueryLetRef"/>
                           </operand>
                        </operand>
                     </operand>
                     <operand xsi:type="ToDecimal">
                        <operand xsi:type="Subtract">
                           <operand name="daysPast" xsi:type="OperandRef"/>
                           <operand name="endDifference" xsi:type="QueryLetRef"/>
                        </operand>
                     </operand>
                  </operand>
                  <operand xsi:type="ToDecimal">
                     <operand name="numDaysInDaysPast" xsi:type="OperandRef"/>
                  </operand>
               </expression>
            </return>
         </expression>
         <operand name="Orders">
            <operandTypeSpecifier xsi:type="ListTypeSpecifier">
               <elementType name="fhir:MedicationRequest" xsi:type="NamedTypeSpecifier"/>
            </operandTypeSpecifier>
         </operand>
         <operand name="daysPast">
            <operandTypeSpecifier name="t:Integer" xsi:type="NamedTypeSpecifier"/>
         </operand>
         <operand name="numDaysInDaysPast">
            <operandTypeSpecifier name="t:Integer" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="IsNaloxone" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="InValueSet">
            <code name="rxNormCode" xsi:type="OperandRef"/>
            <valueset name="Naloxone"/>
         </expression>
         <operand name="rxNormCode">
            <operandTypeSpecifier name="t:Code" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="IsBenzodiazepine" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="InValueSet">
            <code name="rxNormCode" xsi:type="OperandRef"/>
            <valueset name="Benzodiazepines"/>
         </expression>
         <operand name="rxNormCode">
            <operandTypeSpecifier name="t:Code" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="IsOpioidWithAmbulatoryAbusePotential" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="InValueSet">
            <code name="rxNormCode" xsi:type="OperandRef"/>
            <valueset name="Ambulatory Abuse Potential Opioids"/>
         </expression>
         <operand name="rxNormCode">
            <operandTypeSpecifier name="t:Code" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="IsLongActingOpioid" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="InValueSet">
            <code name="rxNormCode" xsi:type="OperandRef"/>
            <valueset name="Long Acting Opioids"/>
         </expression>
         <operand name="rxNormCode">
            <operandTypeSpecifier name="t:Code" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="IsEndOfLifeOpioid" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="InValueSet">
            <code name="rxNormCode" xsi:type="OperandRef"/>
            <valueset name="End Of Life Opioids"/>
         </expression>
         <operand name="rxNormCode">
            <operandTypeSpecifier name="t:Code" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="IsOpioidDrugScreen" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="InValueSet">
            <code name="observationCode" xsi:type="OperandRef"/>
            <valueset name="Opioid Drug Screening"/>
         </expression>
         <operand name="observationCode">
            <operandTypeSpecifier name="t:Code" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="IsIllicitDrugScreen" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="InValueSet">
            <code name="observationCode" xsi:type="OperandRef"/>
            <valueset name="Illicit Drug Screening"/>
         </expression>
         <operand name="observationCode">
            <operandTypeSpecifier name="t:Code" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
      <def name="GetIngredient" context="Patient" accessLevel="Public" xsi:type="FunctionDef">
         <expression xsi:type="Query">
            <source alias="$this">
               <expression name="GetIngredients" libraryName="OMTKLogic" xsi:type="FunctionRef">
                  <operand name="rxNormCode" xsi:type="OperandRef"/>
               </expression>
            </source>
            <where xsi:type="Not">
               <operand xsi:type="IsNull">
                  <operand path="ingredientName" xsi:type="Property">
                     <source name="$this" xsi:type="AliasRef"/>
                  </operand>
               </operand>
            </where>
            <return>
               <expression path="ingredientName" xsi:type="Property">
                  <source name="$this" xsi:type="AliasRef"/>
               </expression>
            </return>
         </expression>
         <operand name="rxNormCode">
            <operandTypeSpecifier name="t:Code" xsi:type="NamedTypeSpecifier"/>
         </operand>
      </def>
   </statements>
</library>

content
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Usage note: every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification.