---
type: "codesystem"
title: "Questionnaire Item Operator"
codesystem: "questionnaire-enable-operator"
---
# Questionnaire Item Operator

- **Official URL**: http://hl7.org/fhir/questionnaire-enable-operator
- **Version**: 6.0.0
- **Status**: active
- **Name**: QuestionnaireItemOperator
- **Title**: Questionnaire Item Operator
- **Publisher**: HL7 (FHIR Project)
- **Description**: The criteria by which a question is enabled.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| exists | Exists | True if the determination of 'whether an answer exists for the question' is equal to the enableWhen answer (which must be a boolean). |
| = | Equals | True if at least one answer has a value that is equal to the enableWhen answer. |
| != | Not Equals | True if no answer has a value that is equal to the enableWhen answer. |
| > | Greater Than | True if at least one answer has a value that is greater than the enableWhen answer. |
| < | Less Than | True if at least one answer has a value that is less than the enableWhen answer. |
| >= | Greater or Equals | True if at least one answer has a value that is greater or equal to the enableWhen answer. |
| <= | Less or Equals | True if at least one answer has a value that is less or equal to the enableWhen answer. |

## CodeSystem XML



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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="questionnaire-enable-operator"/>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="fhir"/>
  </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="3"/>
  </extension>
  <url value="http://hl7.org/fhir/questionnaire-enable-operator"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.1006"/>
  </identifier>
  <version value="6.0.0"/>
  <name value="QuestionnaireItemOperator"/>
  <title value="Questionnaire Item Operator"/>
  <status value="active"/>
  <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="The criteria by which a question is enabled."/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/questionnaire-enable-operator"/>
  <content value="complete"/>
  <concept>
    <code value="exists"/>
    <display value="Exists"/>
    <definition value="True if the determination of 'whether an answer exists for the question' is equal to the enableWhen answer (which must be a boolean)."/>
  </concept>
  <concept>
    <code value="="/>
    <display value="Equals"/>
    <definition value="True if at least one answer has a value that is equal to the enableWhen answer."/>
  </concept>
  <concept>
    <code value="!="/>
    <display value="Not Equals"/>
    <definition value="True if no answer has a value that is equal to the enableWhen answer."/>
  </concept>
  <concept>
    <code value="&gt;"/>
    <display value="Greater Than"/>
    <definition value="True if at least one answer has a value that is greater than the enableWhen answer."/>
  </concept>
  <concept>
    <code value="&lt;"/>
    <display value="Less Than"/>
    <definition value="True if at least one answer has a value that is less than the enableWhen answer."/>
  </concept>
  <concept>
    <code value="&gt;="/>
    <display value="Greater or Equals"/>
    <definition value="True if at least one answer has a value that is greater or equal to the enableWhen answer."/>
  </concept>
  <concept>
    <code value="&lt;="/>
    <display value="Less or Equals"/>
    <definition value="True if at least one answer has a value that is less or equal to the enableWhen answer."/>
  </concept>
</CodeSystem>
```