Release 4B

This page is part of the FHIR Specification (v4.3.0: R4B - STU). This is the current published version in it's permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions Code System

FHIR Infrastructure Work Group Maturity Level: 2Trial Use Use Context: Any

This is a code system defined by the FHIR project.


Defining URL:

The type of operator to use for assertion.

Committee:FHIR Infrastructure Work Group
OID:2.16.840.1.113883.4.642.4.709 (for OID based terminology systems)
Source ResourceXML / JSON

This Code system is used in the following value sets:

The type of operator to use for assertion.

This code system defines the following codes:

Code Display Definition
equals equals Default value. Equals comparison.
notEquals notEquals Not equals comparison.
in in Compare value within a known set of values.
notIn notIn Compare value not within a known set of values.
greaterThan greaterThan Compare value to be greater than a known value.
lessThan lessThan Compare value to be less than a known value.
empty empty Compare value is empty.
notEmpty notEmpty Compare value is not empty.
contains contains Compare value string contains a known value.
notContains notContains Compare value string does not contain a known value.
eval evaluate Evaluate the FHIRPath expression as a boolean condition.


See the full registry of code systems defined as part of FHIR.

Explanation of the columns that may appear on this page:

LevelA few code lists that FHIR defines are hierarchical - each code is assigned a level. See Code System for further information.
SourceThe source of the definition of the code (when the value set draws in codes defined elsewhere)
CodeThe code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract')
DisplayThe 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
DefinitionAn explanation of the meaning of the concept
CommentsAdditional notes about how to use the code