StructureDefinition
for
Coding
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padding-left: 3px; padding-right: 3px; border: 1px grey solid; font-weight: bold; color:
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padding:0px 4px 0px 4pxA reference to a code defined by a terminology system
Elements defined in Ancestors:
Unique id for the element within a resource (for internal references). This may be any
string value that does not contain spaces.,
May be used to represent additional information that is not part of the basic definition
of the element. To make the use of extensions safe and manageable, there is a strict set
of governance applied to the definition and use of extensions. Though any implementer
can define an extension, there is a set of requirements that SHALL be met as part of the
definition of the extension.
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Coding.system : The identification of the code system that defines the meaning of the
symbol in the code.
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Coding.version : The version of the code system which was used when choosing this code.
Note that a well-maintained code system does not need the version reported, because the
meaning of codes is consistent across versions. However this cannot consistently be assured,
and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged.
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Coding.code : A symbol in syntax defined by the system. The symbol may be a predefined
code or an expression in a syntax defined by the coding system (e.g. post-coordination).
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Coding.display : A representation of the meaning of the code in the system, following
the rules of the system.
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Coding.userSelected : Indicates that this coding was chosen by a user directly - e.g.
off a pick list of available items (codes or displays).
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padding:0px 4px 0px 4px
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Documentation for this format
Base StructureDefinition for Coding Type: A reference to a code defined by a terminology
system.
Codes may be defined very casually in enumerations or code lists, up to very formal definitions
such as SNOMED CT - see the HL7 v3 Core Principles for more information.
Unique id for the element within a resource (for internal references). This may be any
string value that does not contain spaces.
<!-- Note: special primitive values have a FHIRPath system type. e.g. this is compiler magic
(j) -->
May be used to represent additional information that is not part of the basic definition
of the element. To make the use of extensions safe and manageable, there is a strict set
of governance applied to the definition and use of extensions. Though any implementer
can define an extension, there is a set of requirements that SHALL be met as part of the
definition of the extension.
There can be no stigma associated with the use of extensions by any application, project,
or standard - regardless of the institution or jurisdiction that uses or defines the extensions.
The use of extensions is what allows the FHIR specification to retain a core level of
simplicity for everyone.
The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be
references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of
FHIR defined special URIs or it should reference to some definition that establishes the
system clearly and unambiguously.
The version of the code system which was used when choosing this code. Note that a well-maintained
code system does not need the version reported, because the meaning of codes is consistent
across versions. However this cannot consistently be assured, and when the meaning is
not guaranteed to be consistent, the version SHOULD be exchanged.
Where the terminology does not clearly define what string should be used to identify code
system versions, the recommendation is to use the date (expressed in FHIR date format)
on which that version was officially published as the version date.
A symbol in syntax defined by the system. The symbol may be a predefined code or an expression
in a syntax defined by the coding system (e.g. post-coordination).
A representation of the meaning of the code in the system, following the rules of the
system.
Need to be able to carry a human-readable meaning of the code for readers that do not
know the system.
Indicates that this coding was chosen by a user directly - e.g. off a pick list of available
items (codes or displays).
Amongst a set of alternatives, a directly chosen code is the most appropriate starting
point for new translations. There is some ambiguity about what exactly 'directly chosen'
implies, and trading partner agreement may be needed to clarify the use of this element
and its consequences more completely.
This has been identified as a clinical safety criterium - that this exact system/code
pair was chosen explicitly, rather than inferred by the system based on some rules or
language processing.
fhir:Coding.userSelected fhir:mapsTo dt:CDCoding.codingRationale. fhir:Coding.userSelected
fhir:hasMap fhir:Coding.userSelected.map. fhir:Coding.userSelected.map a fhir:Map; fhir:target
dt:CDCoding.codingRationale. fhir:Coding.userSelected\#true a [ fhir:source "true";
fhir:target dt:CDCoding.codingRationale\#O ]
Codes may be defined very casually in enumerations or code lists, up to very formal definitions
such as SNOMED CT - see the HL7 v3 Core Principles for more information.
The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be
references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of
FHIR defined special URIs or it should reference to some definition that establishes the
system clearly and unambiguously.
The version of the code system which was used when choosing this code. Note that a well-maintained
code system does not need the version reported, because the meaning of codes is consistent
across versions. However this cannot consistently be assured, and when the meaning is
not guaranteed to be consistent, the version SHOULD be exchanged.
Where the terminology does not clearly define what string should be used to identify code
system versions, the recommendation is to use the date (expressed in FHIR date format)
on which that version was officially published as the version date.
A symbol in syntax defined by the system. The symbol may be a predefined code or an expression
in a syntax defined by the coding system (e.g. post-coordination).
A representation of the meaning of the code in the system, following the rules of the
system.
Need to be able to carry a human-readable meaning of the code for readers that do not
know the system.
Indicates that this coding was chosen by a user directly - e.g. off a pick list of available
items (codes or displays).
Amongst a set of alternatives, a directly chosen code is the most appropriate starting
point for new translations. There is some ambiguity about what exactly 'directly chosen'
implies, and trading partner agreement may be needed to clarify the use of this element
and its consequences more completely.
This has been identified as a clinical safety criterium - that this exact system/code
pair was chosen explicitly, rather than inferred by the system based on some rules or
language processing.
fhir:Coding.userSelected fhir:mapsTo dt:CDCoding.codingRationale. fhir:Coding.userSelected
fhir:hasMap fhir:Coding.userSelected.map. fhir:Coding.userSelected.map a fhir:Map; fhir:target
dt:CDCoding.codingRationale. fhir:Coding.userSelected\#true a [ fhir:source "true";
fhir:target dt:CDCoding.codingRationale\#O ]
<?xml version="1.0" encoding="UTF-8"?>
<StructureDefinition xmlns="http://hl7.org/fhir"> <id value="Coding"/> <text> <status value="generated"/> <div xmlns="http://www.w3.org/1999/xhtml"> <table border="0" cellpadding="0" cellspacing="0" style="border: 0px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align:
top;">
<tr style="border: 1px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align:
top">
<th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="The logical name of the element">Name</a> </th> <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Information about the use of the element">Flags</a> </th> <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Minimum and Maximum # of times the element can appear in the instance">Card.</a> </th> <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px; width: 100px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Reference to the type of the element">Type</a> </th> <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Additional information about the element">Description & Constraints</a> <span style="float: right"> <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format"> <img alt="doco" src="data:(snipped in html view)" style="background-color: inherit"/> </a> </span> </th> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
white">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAAJUlEQVR4Xu3IIQEAAAg
DsHd9/w4EQIOamFnaBgAA4MMKAACAKwNp30CqZFfFmwAAAABJRU5ErkJggg==)">
<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: white; background-color: inherit" title="Element"/> <a href="datatypes-definitions.html#Coding" title="Coding : A reference to a code defined by a terminology system.">Coding</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
<a href="versions.html#std-process" style="padding-left: 3px; padding-right: 3px; border: 1px grey solid; font-weight: bold;
color: black; background-color: #e6ffe6; padding-left: 3px; padding-right: 3px;
border: 1px grey solid; font-weight: bold; color: black; background-color: #e6ffe6" title="Standards Status = Normative">N</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px"/>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="types.html#Element">Element</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">A reference to a code defined by a terminology system
<br/> <span style="font-style: italic" title="cod-1">+ Warning: A Coding SHOULD NOT have a display unless a code is also present. Computation
on Coding.display alone is generally unsafe. Consider using CodeableConcept.text</span>
<br/> <br/> Elements defined in Ancestors: <a href="types.html#Element" title="Unique id for the element within a resource (for internal references). This may
be any string value that does not contain spaces.">id</a> ,
<a href="types.html#Element" title="May be used to represent additional information that is not part of the basic definition
of the element. To make the use of extensions safe and managable, there is a strict
set of governance applied to the definition and use of extensions. Though any implementer
can define an extension, there is a set of requirements that SHALL be met as part
of the definition of the extension.">extension</a>
</td> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
#F7F7F7">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAALUlEQVR4Xu3IoREAIAw
EwfT6/ddA0GBAxO3NrLlKUj9263wAAAAvrgEAADClAVWFQIBRHMicAAAAAElFTkSuQmCC)">
<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: #F7F7F7; background-color: inherit" title="Primitive Data Type"/> <a href="datatypes-definitions.html#Coding.system" title="Coding.system : The identification of the code system that defines the meaning
of the symbol in the code.">system</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">0..1</td>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="datatypes.html#uri">uri</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">Identity of the terminology system
<br/> </td> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
white">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAALUlEQVR4Xu3IoREAIAw
EwfT6/ddA0GBAxO3NrLlKUj9263wAAAAvrgEAADClAVWFQIBRHMicAAAAAElFTkSuQmCC)">
<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: white; background-color: inherit" title="Primitive Data Type"/> <a href="datatypes-definitions.html#Coding.version" title="Coding.version : The version of the code system which was used when choosing this
code. Note that a well-maintained code system does not need the version reported,
because the meaning of codes is consistent across versions. However this cannot
consistently be assured, and when the meaning is not guaranteed to be consistent,
the version SHOULD be exchanged.">version</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">0..1</td>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="datatypes.html#string">string</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">Version of the system - if relevant
<br/> </td> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
#F7F7F7">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAALUlEQVR4Xu3IoREAIAw
EwfT6/ddA0GBAxO3NrLlKUj9263wAAAAvrgEAADClAVWFQIBRHMicAAAAAElFTkSuQmCC)">
<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: #F7F7F7; background-color: inherit" title="Primitive Data Type"/> <a href="datatypes-definitions.html#Coding.code" title="Coding.code : A symbol in syntax defined by the system. The symbol may be a predefined
code or an expression in a syntax defined by the coding system (e.g. post-coordination).">code</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
<a href="conformance-rules.html#constraints" style="padding-left: 3px; padding-right: 3px; border: 1px maroon solid; font-weight: bold;
color: #301212; background-color: #fdf4f4;; padding-left: 3px; padding-right: 3px;
border: 1px maroon solid; font-weight: bold; color: #301212; background-color:
#fdf4f4;" title="This element has or is affected by some invariants">C</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">0..1</td>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="datatypes.html#code">code</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">Symbol in syntax defined by the system
<br/> </td> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
white">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAALUlEQVR4Xu3IoREAIAw
EwfT6/ddA0GBAxO3NrLlKUj9263wAAAAvrgEAADClAVWFQIBRHMicAAAAAElFTkSuQmCC)">
<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: white; background-color: inherit" title="Primitive Data Type"/> <a href="datatypes-definitions.html#Coding.display" title="Coding.display : A representation of the meaning of the code in the system, following
the rules of the system.">display</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
<a href="languages.html#translatable" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is a candidate for being translated">T</a>
<a href="conformance-rules.html#constraints" style="padding-left: 3px; padding-right: 3px; border: 1px maroon solid; font-weight: bold;
color: #301212; background-color: #fdf4f4;; padding-left: 3px; padding-right: 3px;
border: 1px maroon solid; font-weight: bold; color: #301212; background-color:
#fdf4f4;" title="This element has or is affected by some invariants">C</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">0..1</td>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="datatypes.html#string">string</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">Representation defined by the system
<br/> </td> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
#F7F7F7">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAAJUlEQVR4Xu3IIQEAAAg
DsHd9/w4EQIOamFnaBgAA4MMKAACAKwNp30CqZFfFmwAAAABJRU5ErkJggg==)">
<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: #F7F7F7; background-color: inherit" title="Primitive Data Type"/> <a href="datatypes-definitions.html#Coding.userSelected" title="Coding.userSelected : Indicates that this coding was chosen by a user directly
- e.g. off a pick list of available items (codes or displays).">userSelected</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">0..1</td>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="datatypes.html#boolean">boolean</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">If this coding was chosen directly by the user
<br/> </td> </tr> <tr> <td class="hierarchy" colspan="5"> <br/> <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format"> <img alt="doco" src="data:(snipped in html view)" style="background-color: inherit"/> Documentation for this format </a> </td> </tr> </table> </div> </text> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"> <valueCode value="normative"/> </extension> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics"> <valueCode value="can-bind"/> </extension> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics"> <valueCode value="do-translations"/> </extension> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"> <valueCode value="fhir"/> </extension> <url value="http://hl7.org/fhir/StructureDefinition/Coding"/> <version value="6.0.0-ballot4"/> <name value="Coding"/> <status value="active"/> <experimental value="false"/> <date value="2025-12-18T07:07:42+11:00"/> <publisher value="HL7 International / FHIR Infrastructure"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <contact> <telecom> <system value="url"/> <value value="http://www.hl7.org/Special/committees/fiwg"/> </telecom> </contact> <description value="Coding Type: A reference to a code defined by a terminology system."/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <purpose value="References to codes are very common in healthcare models."/> <fhirVersion value="6.0.0-ballot4"/> <mapping> <identity value="v2"/> <uri value="http://hl7.org/v2"/> <name value="HL7 V2 Mapping"/> </mapping> <mapping> <identity value="rim"/> <uri value="http://hl7.org/v3"/> <name value="RIM Mapping"/> </mapping> <mapping> <identity value="orim"/> <uri value="http://hl7.org/orim"/> <name value="Ontological RIM Mapping"/> </mapping> <kind value="complex-type"/> <abstract value="false"/> <type value="Coding"/> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/DataType"/> <derivation value="specialization"/> <snapshot> <element id="Coding"> <path value="Coding"/> <short value="A reference to a code defined by a terminology system"/> <definition value="A reference to a code defined by a terminology system."/> <comment value="Codes may be defined very casually in enumerations or code lists, up to very formal
definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information."/>
<min value="0"/> <max value="*"/> <base> <path value="Coding"/> <min value="0"/> <max value="*"/> </base> <constraint> <key value="cod-1"/> <severity value="warning"/> <human value="A Coding SHOULD NOT have a display unless a code is also present. Computation
on Coding.display alone is generally unsafe. Consider using CodeableConcept.text"/>
<expression value="code.exists().not() implies display.exists().not()"/> <source value="http://hl7.org/fhir/StructureDefinition/Coding"/> </constraint> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <mapping> <identity value="rim"/> <map value="n/a,CV"/> </mapping> <mapping> <identity value="v2"/> <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/> </mapping> </element> <element id="Coding.id"> <path value="Coding.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may
be any string value that does not contain spaces."/>
<min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base>
<type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="string"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <condition value="ele-1"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Coding.extension"> <path value="Coding.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <rules value="open"/> </slicing> <short value="Additional content defined by implementations"/> <definition value="May be used to represent additional information that is not part of the basic definition
of the element. To make the use of extensions safe and managable, there is a strict
set of governance applied to the definition and use of extensions. Though any implementer
can define an extension, there is a set of requirements that SHALL be met as part
of the definition of the extension."/>
<comment value="There can be no stigma associated with the use of extensions by any application,
project, or standard - regardless of the institution or jurisdiction that uses
or defines the extensions. The use of extensions is what allows the FHIR specification
to retain a core level of simplicity for everyone."/>
<alias value="extensions"/> <alias value="user content"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Coding.system"> <path value="Coding.system"/> <short value="Identity of the terminology system"/> <definition value="The identification of the code system that defines the meaning of the symbol in
the code."/>
<comment value="The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL
be references to the HL7 OID registry. Otherwise, the URI should come from HL7's
list of FHIR defined special URIs or it should be an absolute reference to some
definition that establishes the system clearly and unambiguously."/>
<requirements value="Need to be unambiguous about the source of the definition of the symbol."/> <min value="0"/> <max value="1"/> <base> <path value="Coding.system"/> <min value="0"/> <max value="1"/> </base> <type> <code value="uri"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="C*E.3"/> </mapping> <mapping> <identity value="rim"/> <map value="./codeSystem"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.system rdfs:subPropertyOf dt:CDCoding.codeSystem"/> </mapping> </element> <element id="Coding.version"> <path value="Coding.version"/> <short value="Version of the system - if relevant"/> <definition value="The version of the code system which was used when choosing this code. Note that
a well-maintained code system does not need the version reported, because the meaning
of codes is consistent across versions. However this cannot consistently be assured,
and when the meaning is not guaranteed to be consistent, the version SHOULD be
exchanged."/>
<comment value="Where the terminology does not clearly define what string should be used to identify
code system versions, the recommendation is to use the date (expressed in FHIR
date format) on which that version was officially published as the version date."/>
<min value="0"/> <max value="1"/> <base> <path value="Coding.version"/> <min value="0"/> <max value="1"/> </base> <type> <code value="string"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="C*E.7"/> </mapping> <mapping> <identity value="rim"/> <map value="./codeSystemVersion"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.version rdfs:subPropertyOf dt:CDCoding.codeSystemVersion"/> </mapping> </element> <element id="Coding.code"> <extension url="http://hl7.org/fhir/tools/StructureDefinition/no-binding"> <valueBoolean value="true"/> </extension> <path value="Coding.code"/> <short value="Symbol in syntax defined by the system"/> <definition value="A symbol in syntax defined by the system. The symbol may be a predefined code or
an expression in a syntax defined by the coding system (e.g. post-coordination)."/>
<requirements value="Need to refer to a particular code in the system."/> <min value="0"/> <max value="1"/> <base> <path value="Coding.code"/> <min value="0"/> <max value="1"/> </base> <type> <code value="code"/> </type> <condition value="cod-1"/> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="C*E.1"/> </mapping> <mapping> <identity value="rim"/> <map value="./code"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.code rdfs:subPropertyOf dt:CDCoding.code"/> </mapping> </element> <element id="Coding.display"> <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable"> <valueBoolean value="true"/> </extension> <path value="Coding.display"/> <short value="Representation defined by the system"/> <definition value="A representation of the meaning of the code in the system, following the rules
of the system."/>
<requirements value="Need to be able to carry a human-readable meaning of the code for readers that
do not know the system."/>
<min value="0"/> <max value="1"/> <base> <path value="Coding.display"/> <min value="0"/> <max value="1"/> </base> <type> <code value="string"/> </type> <condition value="cod-1"/> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="C*E.2 - but note this is not well followed"/> </mapping> <mapping> <identity value="rim"/> <map value="CV.displayName"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.display rdfs:subPropertyOf dt:CDCoding.displayName"/> </mapping> </element> <element id="Coding.userSelected"> <path value="Coding.userSelected"/> <short value="If this coding was chosen directly by the user"/> <definition value="Indicates that this coding was chosen by a user directly - e.g. off a pick list
of available items (codes or displays)."/>
<comment value="Amongst a set of alternatives, a directly chosen code is the most appropriate starting
point for new translations. There is some ambiguity about what exactly 'directly
chosen' implies, and trading partner agreement may be needed to clarify the use
of this element and its consequences more completely."/>
<requirements value="This has been identified as a clinical safety criterium - that this exact system/code
pair was chosen explicitly, rather than inferred by the system based on some rules
or language processing."/>
<min value="0"/> <max value="1"/> <base> <path value="Coding.userSelected"/> <min value="0"/> <max value="1"/> </base> <type> <code value="boolean"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="Sometimes implied by being first"/> </mapping> <mapping> <identity value="rim"/> <map value="CD.codingRationale"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.userSelected fhir:mapsTo dt:CDCoding.codingRationale. fhir:Coding.userSelected
fhir:hasMap fhir:Coding.userSelected.map. fhir:Coding.userSelected.map a fhir:Map;
fhir:target dt:CDCoding.codingRationale. fhir:Coding.userSelected\#true a [
fhir:source "true"; fhir:target dt:CDCoding.codingRationale\#O
]"/>
</mapping> </element> </snapshot> <differential> <element id="Coding"> <path value="Coding"/> <short value="A reference to a code defined by a terminology system"/> <definition value="A reference to a code defined by a terminology system."/> <comment value="Codes may be defined very casually in enumerations or code lists, up to very formal
definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information."/>
<min value="0"/> <max value="*"/> <constraint> <key value="cod-1"/> <severity value="warning"/> <human value="A Coding SHOULD NOT have a display unless a code is also present. Computation
on Coding.display alone is generally unsafe. Consider using CodeableConcept.text"/>
<expression value="code.exists().not() implies display.exists().not()"/> <source value="http://hl7.org/fhir/StructureDefinition/Coding"/> </constraint> <mapping> <identity value="v2"/> <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/> </mapping> <mapping> <identity value="rim"/> <map value="CV"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/> </mapping> </element> <element id="Coding.system"> <path value="Coding.system"/> <short value="Identity of the terminology system"/> <definition value="The identification of the code system that defines the meaning of the symbol in
the code."/>
<comment value="The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL
be references to the HL7 OID registry. Otherwise, the URI should come from HL7's
list of FHIR defined special URIs or it should be an absolute reference to some
definition that establishes the system clearly and unambiguously."/>
<requirements value="Need to be unambiguous about the source of the definition of the symbol."/> <min value="0"/> <max value="1"/> <type> <code value="uri"/> </type> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="C*E.3"/> </mapping> <mapping> <identity value="rim"/> <map value="./codeSystem"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.system rdfs:subPropertyOf dt:CDCoding.codeSystem"/> </mapping> </element> <element id="Coding.version"> <path value="Coding.version"/> <short value="Version of the system - if relevant"/> <definition value="The version of the code system which was used when choosing this code. Note that
a well-maintained code system does not need the version reported, because the meaning
of codes is consistent across versions. However this cannot consistently be assured,
and when the meaning is not guaranteed to be consistent, the version SHOULD be
exchanged."/>
<comment value="Where the terminology does not clearly define what string should be used to identify
code system versions, the recommendation is to use the date (expressed in FHIR
date format) on which that version was officially published as the version date."/>
<min value="0"/> <max value="1"/> <type> <code value="string"/> </type> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="C*E.7"/> </mapping> <mapping> <identity value="rim"/> <map value="./codeSystemVersion"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.version rdfs:subPropertyOf dt:CDCoding.codeSystemVersion"/> </mapping> </element> <element id="Coding.code"> <extension url="http://hl7.org/fhir/tools/StructureDefinition/no-binding"> <valueBoolean value="true"/> </extension> <path value="Coding.code"/> <short value="Symbol in syntax defined by the system"/> <definition value="A symbol in syntax defined by the system. The symbol may be a predefined code or
an expression in a syntax defined by the coding system (e.g. post-coordination)."/>
<requirements value="Need to refer to a particular code in the system."/> <min value="0"/> <max value="1"/> <type> <code value="code"/> </type> <condition value="cod-1"/> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="C*E.1"/> </mapping> <mapping> <identity value="rim"/> <map value="./code"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.code rdfs:subPropertyOf dt:CDCoding.code"/> </mapping> </element> <element id="Coding.display"> <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable"> <valueBoolean value="true"/> </extension> <path value="Coding.display"/> <short value="Representation defined by the system"/> <definition value="A representation of the meaning of the code in the system, following the rules
of the system."/>
<requirements value="Need to be able to carry a human-readable meaning of the code for readers that
do not know the system."/>
<min value="0"/> <max value="1"/> <type> <code value="string"/> </type> <condition value="cod-1"/> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="C*E.2 - but note this is not well followed"/> </mapping> <mapping> <identity value="rim"/> <map value="CV.displayName"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.display rdfs:subPropertyOf dt:CDCoding.displayName"/> </mapping> </element> <element id="Coding.userSelected"> <path value="Coding.userSelected"/> <short value="If this coding was chosen directly by the user"/> <definition value="Indicates that this coding was chosen by a user directly - e.g. off a pick list
of available items (codes or displays)."/>
<comment value="Amongst a set of alternatives, a directly chosen code is the most appropriate starting
point for new translations. There is some ambiguity about what exactly 'directly
chosen' implies, and trading partner agreement may be needed to clarify the use
of this element and its consequences more completely."/>
<requirements value="This has been identified as a clinical safety criterium - that this exact system/code
pair was chosen explicitly, rather than inferred by the system based on some rules
or language processing."/>
<min value="0"/> <max value="1"/> <type> <code value="boolean"/> </type> <isSummary value="true"/> <mapping> <identity value="v2"/> <map value="Sometimes implied by being first"/> </mapping> <mapping> <identity value="rim"/> <map value="CD.codingRationale"/> </mapping> <mapping> <identity value="orim"/> <map value="fhir:Coding.userSelected fhir:mapsTo dt:CDCoding.codingRationale. fhir:Coding.userSelected
fhir:hasMap fhir:Coding.userSelected.map. fhir:Coding.userSelected.map a fhir:Map;
fhir:target dt:CDCoding.codingRationale. fhir:Coding.userSelected\#true a [
fhir:source "true"; fhir:target dt:CDCoding.codingRationale\#O
]"/>
</mapping> </element> </differential>
</
StructureDefinition
>
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.
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