Vital Records Common Library (VRCL) FHIR Implementation Guide, published by HL7 International / Public Health. This guide is not an authorized publication; it is the continuous build for version 2.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/vr-common-library/ and changes regularly. See the Directory of published versions

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: Value Set - Units of Age Vital Records

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<ValueSet xmlns="http://hl7.org/fhir">
  <id value="ValueSet-units-of-age-vr"/>
  <language value="en"/>
  <text>
    <status value="extensions"/>
    <div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: ValueSet ValueSet-units-of-age-vr</b></p><a name="ValueSet-units-of-age-vr"> </a><a name="hcValueSet-units-of-age-vr"> </a><p>This value set includes codes based on the following rules:</p><ul><li>Include these codes as defined in <a href="http://unitsofmeasure.org"><code>http://unitsofmeasure.org</code></a><span title="Version is not explicitly stated. No matching Code System found"> version Not Stated (use latest from terminology server)</span><table class="none"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td></tr><tr><td>min</td><td>Minutes</td></tr><tr><td>d</td><td>Days</td></tr><tr><td>h</td><td>Hours</td></tr><tr><td>mo</td><td>Months</td></tr><tr><td>a</td><td>Years</td></tr></table></li><li>Include these codes as defined in <a href="http://terminology.hl7.org/7.4.0/CodeSystem-v3-NullFlavor.html"><code>http://terminology.hl7.org/CodeSystem/v3-NullFlavor</code></a><span title="Version is explicitly stated to be 4.0.0"> version &#x1F4CD;4.0.0</span><table class="none"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td><a href="http://terminology.hl7.org/7.4.0/CodeSystem-v3-NullFlavor.html#v3-NullFlavor-UNK">UNK</a></td><td>unknown</td><td>**Description:**A proper value is applicable, but not known.<br/><br/>**Usage Notes**: This means the actual value is not known. If the only thing that is unknown is how to properly express the value in the necessary constraints (value set, datatype, etc.), then the OTH or UNC flavor should be used. No properties should be included for a datatype with this property unless:<br/><br/>1.  Those properties themselves directly translate to a semantic of &quot;unknown&quot;. (E.g. a local code sent as a translation that conveys 'unknown')<br/>2.  Those properties further qualify the nature of what is unknown. (E.g. specifying a use code of &quot;H&quot; and a URL prefix of &quot;tel:&quot; to convey that it is the home phone number that is unknown.)</td></tr></table></li></ul></div>
  </text>
  <extension
             url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="pher"/>
  </extension>
  <url
       value="http://hl7.org/fhir/us/vr-common-library/ValueSet/ValueSet-units-of-age-vr"/>
  <version value="2.0.0"/>
  <name value="ValueSetUnitsOfAgeVitalRecords"/>
  <title value="Value Set - Units of Age Vital Records"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2026-10-16T18:03:27+00:00"/>
  <publisher value="HL7 International / Public Health"/>
  <contact>
    <name value="HL7 International / Public Health"/>
    <telecom>
      <system value="url"/>
      <value value="http://www.hl7.org/Special/committees/pher"/>
    </telecom>
  </contact>
  <description
               value="This valueset contains the set of codes for specifying the units used when recording age (days, years, etc.).

Mapping to IJE codes [here](ConceptMap-ConceptMapUnitsOfAgeVitalRecords.html)."/>
  <jurisdiction>
    <coding>
      <system value="urn:iso:std:iso:3166"/>
      <code value="US"/>
      <display value="United States of America"/>
    </coding>
  </jurisdiction>
  <compose>
    <include>
      <system value="http://unitsofmeasure.org"/>
      <concept>
        <code value="min"/>
        <display value="Minutes"/>
      </concept>
      <concept>
        <code value="d"/>
        <display value="Days"/>
      </concept>
      <concept>
        <code value="h"/>
        <display value="Hours"/>
      </concept>
      <concept>
        <code value="mo"/>
        <display value="Months"/>
      </concept>
      <concept>
        <code value="a"/>
        <display value="Years"/>
      </concept>
    </include>
    <include>
      <system value="http://terminology.hl7.org/CodeSystem/v3-NullFlavor"/>
      <version value="4.0.0"/>
      <concept>
        <code value="UNK"/>
        <display value="unknown"/>
      </concept>
    </include>
  </compose>
</ValueSet>