<?xml version="1.0" encoding="UTF-8"?><CodeSystem xmlns="http://hl7.org/fhir"><id value="task-performer-function-code"/><meta><lastUpdated value="2026-04-03T20:06:10.198+00:00"/></meta><text><status value="generated"/><div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: CodeSystem task-performer-function-code</b></p><a name="task-performer-function-code"> </a><a name="hctask-performer-function-code"> </a><p>This case-sensitive code system <code>http://hl7.org/fhir/task-performer-function-code</code> defines the following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style="white-space:nowrap">performer<a name="task-performer-function-code-performer"> </a></td><td>Performer</td><td>A person, non-person living subject, organization or device that who actually and principally carries out the Task action.</td></tr><tr><td style="white-space:nowrap">verifier<a name="task-performer-function-code-verifier"> </a></td><td>Verifier</td><td>A person who verifies the correctness and appropriateness of the Task action (plan, order, event, etc.) and hence takes on accountability.</td></tr><tr><td style="white-space:nowrap">witness<a name="task-performer-function-code-witness"> </a></td><td>Witness</td><td>A person witnessing the action happening without doing anything. A witness is not necessarily aware, much less approves of anything stated in the service event.</td></tr><tr><td style="white-space:nowrap">referrer<a name="task-performer-function-code-referrer"> </a></td><td>Referrer</td><td>A person having referred the action of the Task to the performer (referring physician).</td></tr></table></div></text><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"><valueCode value="oo"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"><valueCode value="informative"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm"><valueInteger value="1"/></extension><url value="http://hl7.org/fhir/task-performer-function-code"/><version value="6.0.0-ballot4"/><name value="TaskPerformerFunctionCode"/><title value="Task Performer Function Code"/><status value="active"/><experimental value="false"/><date value="2025-03-12T10:00:00+08:00"/><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="The performer of the task."/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/task-performer-function-code"/><content value="complete"/><concept><code value="performer"/><display value="Performer"/><definition value="A person, non-person living subject, organization or device that who actually and principally carries out the Task action."/></concept><concept><code value="verifier"/><display value="Verifier"/><definition value="A person who verifies the correctness and appropriateness of the Task action (plan, order, event, etc.) and hence takes on accountability."/></concept><concept><code value="witness"/><display value="Witness"/><definition value="A person witnessing the action happening without doing anything. A witness is not necessarily aware, much less approves of anything stated in the service event."/></concept><concept><code value="referrer"/><display value="Referrer"/><definition value="A person having referred the action of the Task to the performer (referring physician)."/></concept></CodeSystem>