This page is part of the FHIR Specification v4.1.0: R4B Ballot. About the R4B version of FHIR. The current version which supercedes this version is 5.0.0.  For a full list of available versions, see the Directory of published versions  . Page versions: R5 R4B R4
. Page versions: R5 R4B R4
| FHIR Infrastructure  Work Group | Maturity Level: 3 | Trial Use | Use Context: Any | 
This is a value set defined by the FHIR project.
Summary
| Defining URL: | http://hl7.org/fhir/ValueSet/questionnaire-enable-operator | 
| Version: | 4.1.0 | 
| Name: | QuestionnaireItemOperator | 
| Title: | QuestionnaireItemOperator | 
| Definition: | The criteria by which a question is enabled. | 
| Committee: | FHIR Infrastructure  Work Group | 
| OID: | 2.16.840.1.113883.4.642.3.1005 (for OID based terminology systems) | 
| Source Resource | XML / JSON | 
This value set is used in the following places:
http://hl7.org/fhir/questionnaire-enable-operator
This expansion generated 11 Mar 2021
This value set contains 7 concepts
Expansion based on QuestionnaireItemOperator v4.1.0 (CodeSystem)
All codes from system http://hl7.org/fhir/questionnaire-enable-operator
| Code | Display | Definition | 
| exists | Exists | True if whether an answer exists is equal to the enableWhen answer (which must be a boolean). | 
| = | Equals | True if whether at least one answer has a value that is equal to the enableWhen answer. | 
| != | Not Equals | True if whether at least no answer has a value that is equal to the enableWhen answer. | 
| > | Greater Than | True if whether at least no answer has a value that is greater than the enableWhen answer. | 
| < | Less Than | True if whether at least no answer has a value that is less than the enableWhen answer. | 
| >= | Greater or Equals | True if whether at least no answer has a value that is greater or equal to the enableWhen answer. | 
| <= | Less or Equals | True if whether at least no answer has a value that is less or equal to the enableWhen answer. | 
See the full registry of value sets defined as part of FHIR.
Explanation of the columns that may appear on this page:
| Lvl | A few code lists that FHIR defines are hierarchical - each code is assigned a level. For value sets, levels are mostly used to organize codes for user convenience, but may follow code system hierarchy - see Code System for further information | 
| Source | The source of the definition of the code (when the value set draws in codes defined elsewhere) | 
| Code | The code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract') | 
| Display | The display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application | 
| Definition | An explanation of the meaning of the concept | 
| Comments | Additional notes about how to use the code |