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

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: Encounter Class codes to OMOP

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{
  "resourceType" : "ConceptMap",
  "id" : "EncounterClass",
  "language" : "en",
  "text" : {
    "status" : "generated",
    "div" : "<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>"
  },
  "extension" : [
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode" : "brr"
    },
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode" : "informative",
      "_valueCode" : {
        "extension" : [
          {
            "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical" : "http://hl7.org/fhir/uv/omop/ImplementationGuide/hl7.fhir.uv.omop"
          }
        ]
      }
    }
  ],
  "url" : "http://hl7.org/fhir/uv/omop/ConceptMap/EncounterClass",
  "version" : "1.0.0",
  "name" : "EncounterClassOMOPMapping",
  "title" : "Encounter Class codes to OMOP",
  "status" : "active",
  "experimental" : true,
  "date" : "2026-04-02T22:51:15+00:00",
  "publisher" : "HL7 International / Biomedical Research and Regulation",
  "contact" : [
    {
      "name" : "HL7 International / Biomedical Research and Regulation",
      "telecom" : [
        {
          "system" : "url",
          "value" : "http://www.hl7.org/Special/committees/rcrim"
        }
      ]
    }
  ],
  "description" : "An example mapping of FHIR Encounter class codes to OMOP concept ids",
  "jurisdiction" : [
    {
      "coding" : [
        {
          "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code" : "001",
          "display" : "World"
        }
      ]
    }
  ],
  "group" : [
    {
      "source" : "http://terminology.hl7.org/CodeSystem/v3-ActCode",
      "target" : "https://fhir-terminology.ohdsi.org",
      "element" : [
        {
          "code" : "IMP",
          "target" : [
            {
              "code" : "9201",
              "display" : "Inpatient Visit",
              "relationship" : "equivalent"
            }
          ]
        },
        {
          "code" : "AMB",
          "target" : [
            {
              "code" : "9202",
              "display" : "Outpatient Visit",
              "relationship" : "equivalent"
            }
          ]
        },
        {
          "code" : "OBSENC",
          "target" : [
            {
              "code" : "262",
              "display" : "Emergency Room and Inpatient Visit",
              "relationship" : "source-is-broader-than-target",
              "comment" : "The source code does not necessarily mean that the patient has moved to an inpatient visit"
            }
          ]
        },
        {
          "code" : "EMER",
          "target" : [
            {
              "code" : "9203",
              "display" : "Emergency Room Visit",
              "relationship" : "equivalent"
            }
          ]
        },
        {
          "code" : "VR",
          "target" : [
            {
              "code" : "722455",
              "display" : "Telehealth",
              "relationship" : "equivalent"
            }
          ]
        },
        {
          "code" : "HH",
          "target" : [
            {
              "code" : "581476",
              "display" : "Home Visit",
              "relationship" : "equivalent"
            }
          ]
        }
      ]
    }
  ]
}