FHIR to OMOP FHIR IG
1.0.0 - INFORMATIVE 1 International flag

FHIR to OMOP FHIR IG, published by HL7 International / Biomedical Research and Regulation. This guide is not an authorized publication; it is the continuous build for version 1.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-omop-ig/ and changes regularly. See the Directory of published versions

: Encounter Class codes to OMOP

Page standards status: Informative

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<ConceptMap xmlns="http://hl7.org/fhir">
  <id value="EncounterClass"/>
  <language value="en"/>
  <text>
    <status value="generated"/>
    <div xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en"><p class="res-header-id"><b>Generated Narrative: ConceptMap EncounterClass</b></p><a name="EncounterClass"> </a><a name="hcEncounterClass"> </a><div style="display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%"><p style="margin-bottom: 0px">Language: en</p></div><p>Mapping from (not specified) to (not specified)</p><br/><p><b>Group 1 </b>Mapping from <a href="http://terminology.hl7.org/7.1.0/CodeSystem-v3-ActCode.html">ActCode</a> to <code>https://fhir-terminology.ohdsi.org</code> (OHDSI Standardized Vocabularies)</p><table class="grid"><tr><td><b>Source Code</b></td><td><b>Relationship</b></td><td><b>Target Code</b></td><td><b>Comment</b></td></tr><tr><td>IMP (inpatient encounter)</td><td><a href="http://hl7.org/fhir/R5/codesystem-concept-map-relationship.html#equivalent" title="equivalent">is equivalent to</a></td><td>9201 (Inpatient Visit)</td><td/></tr><tr><td>AMB (ambulatory)</td><td><a href="http://hl7.org/fhir/R5/codesystem-concept-map-relationship.html#equivalent" title="equivalent">is equivalent to</a></td><td>9202 (Outpatient Visit)</td><td/></tr><tr><td>OBSENC (observation encounter)</td><td><a href="http://hl7.org/fhir/R5/codesystem-concept-map-relationship.html#source-is-broader-than-target" title="source-is-broader-than-target">is broader than</a></td><td>262 (Emergency Room and Inpatient Visit)</td><td>The source code does not necessarily mean that the patient has moved to an inpatient visit</td></tr><tr><td>EMER (emergency)</td><td><a href="http://hl7.org/fhir/R5/codesystem-concept-map-relationship.html#equivalent" title="equivalent">is equivalent to</a></td><td>9203 (Emergency Room Visit)</td><td/></tr><tr><td>VR (virtual)</td><td><a href="http://hl7.org/fhir/R5/codesystem-concept-map-relationship.html#equivalent" title="equivalent">is equivalent to</a></td><td>722455 (Telehealth)</td><td/></tr><tr><td>HH (home health)</td><td><a href="http://hl7.org/fhir/R5/codesystem-concept-map-relationship.html#equivalent" title="equivalent">is equivalent to</a></td><td>581476 (Home Visit)</td><td/></tr></table></div>
  </text>
  <extension
             url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="brr"/>
  </extension>
  <extension
             url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="informative">
      <extension
                 url="http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom">
        <valueCanonical
                        value="http://hl7.org/fhir/uv/omop/ImplementationGuide/hl7.fhir.uv.omop"/>
      </extension>
    </valueCode>
  </extension>
  <url value="http://hl7.org/fhir/uv/omop/ConceptMap/EncounterClass"/>
  <version value="1.0.0"/>
  <name value="EncounterClassOMOPMapping"/>
  <title value="Encounter Class codes to OMOP"/>
  <status value="active"/>
  <experimental value="true"/>
  <date value="2026-04-02T22:51:15+00:00"/>
  <publisher value="HL7 International / Biomedical Research and Regulation"/>
  <contact>
    <name value="HL7 International / Biomedical Research and Regulation"/>
    <telecom>
      <system value="url"/>
      <value value="http://www.hl7.org/Special/committees/rcrim"/>
    </telecom>
  </contact>
  <description
               value="An example mapping of FHIR Encounter class codes to OMOP concept ids"/>
  <jurisdiction>
    <coding>
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
      <code value="001"/>
      <display value="World"/>
    </coding>
  </jurisdiction>
  <group>
    <source value="http://terminology.hl7.org/CodeSystem/v3-ActCode"/>
    <target value="https://fhir-terminology.ohdsi.org"/>
    <element>
      <code value="IMP"/>
      <target>
        <code value="9201"/>
        <display value="Inpatient Visit"/>
        <relationship value="equivalent"/>
      </target>
    </element>
    <element>
      <code value="AMB"/>
      <target>
        <code value="9202"/>
        <display value="Outpatient Visit"/>
        <relationship value="equivalent"/>
      </target>
    </element>
    <element>
      <code value="OBSENC"/>
      <target>
        <code value="262"/>
        <display value="Emergency Room and Inpatient Visit"/>
        <relationship value="source-is-broader-than-target"/>
        <comment
                 value="The source code does not necessarily mean that the patient has moved to an inpatient visit"/>
      </target>
    </element>
    <element>
      <code value="EMER"/>
      <target>
        <code value="9203"/>
        <display value="Emergency Room Visit"/>
        <relationship value="equivalent"/>
      </target>
    </element>
    <element>
      <code value="VR"/>
      <target>
        <code value="722455"/>
        <display value="Telehealth"/>
        <relationship value="equivalent"/>
      </target>
    </element>
    <element>
      <code value="HH"/>
      <target>
        <code value="581476"/>
        <display value="Home Visit"/>
        <relationship value="equivalent"/>
      </target>
    </element>
  </group>
</ConceptMap>