Release 4 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:

equals equalsDefault value. Equals comparison.
notEquals notEqualsNot equals comparison.
in inCompare value within a known set of values.
notIn notInCompare value not within a known set of values.
greaterThan greaterThanCompare value to be greater than a known value.
lessThan lessThanCompare value to be less than a known value.
empty emptyCompare value is empty.
notEmpty notEmptyCompare value is not empty.
contains containsCompare value string contains a known value.
notContains notContainsCompare value string does not contain a known value.
eval evaluateEvaluate 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