---
type: "codesystem"
title: "Linkage Type"
codesystem: "linkage-type"
---
# Linkage Type

- **Official URL**: http://hl7.org/fhir/linkage-type
- **Version**: 6.0.0
- **Status**: draft
- **Name**: LinkageType
- **Title**: Linkage Type
- **Publisher**: HL7 (FHIR Project)
- **Description**: Used to distinguish different roles a resource can play within a set of linked resources.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| source | Source of Truth | The resource represents the "source of truth" (from the perspective of this Linkage resource) for the underlying event/condition/etc. |
| alternate | Alternate Record | The resource represents an alternative view of the underlying event/condition/etc.  The resource may still be actively maintained, even though it is not considered to be the source of truth. |
| historical | Historical/Obsolete Record | The resource represents an obsolete record of the underlying event/condition/etc.  It is not expected to be actively maintained. |

## CodeSystem XML



```xml
<?xml version="1.0" encoding="UTF-8"?>

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="linkage-type"/>
  <meta>
    
  </meta>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="pc"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="normative"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="0"/>
  </extension>
  <url value="http://hl7.org/fhir/linkage-type"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.315"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.306"/>
  </identifier>
  <version value="6.0.0"/>
  <name value="LinkageType"/>
  <title value="Linkage Type"/>
  <status value="draft"/>
  <experimental value="false"/>
  <date value="2021-01-05T10:01:24+11:00"/>
  <publisher value="HL7 (FHIR Project)"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="fhir@lists.hl7.org"/>
    </telecom>
  </contact>
  <description value="Used to distinguish different roles a resource can play within a set of linked resources."/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/linkage-type"/>
  <content value="complete"/>
  <concept>
    <code value="source"/>
    <display value="Source of Truth"/>
    <definition value="The resource represents the &quot;source of truth&quot; (from the perspective of this Linkage resource) for the underlying event/condition/etc."/>
  </concept>
  <concept>
    <code value="alternate"/>
    <display value="Alternate Record"/>
    <definition value="The resource represents an alternative view of the underlying event/condition/etc.  The resource may still be actively maintained, even though it is not considered to be the source of truth."/>
  </concept>
  <concept>
    <code value="historical"/>
    <display value="Historical/Obsolete Record"/>
    <definition value="The resource represents an obsolete record of the underlying event/condition/etc.  It is not expected to be actively maintained."/>
  </concept>
</CodeSystem>
```