---
type: "codesystem"
title: "Task Performer Function Code"
codesystem: "task-performer-function-code"
---
# Task Performer Function Code

- **Official URL**: http://hl7.org/fhir/task-performer-function-code
- **Version**: 6.0.0
- **Status**: active
- **Name**: TaskPerformerFunctionCode
- **Title**: Task Performer Function Code
- **Publisher**: HL7 (FHIR Project)
- **Description**: The performer of the task.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| performer | Performer | A person, non-person living subject, organization or device that who actually and principally carries out the Task action. |
| verifier | Verifier | A person who verifies the correctness and appropriateness of the Task action (plan, order, event, etc.) and hence takes on accountability. |
| witness | Witness | 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. |
| referrer | Referrer | A person having referred the action of the Task to the performer (referring physician). |

## CodeSystem XML



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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="task-performer-function-code"/>
  <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"/>
  <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."/>
  <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>
```