Current Build Code System

FHIR Infrastructure Work Group Maturity Level: 4Normative Use Context: Any

Normative Candidate Note: This page is candidate normative content for R4 in the Conformance Package. Once normative, it will lose it's Maturity Level, and breaking changes will no longer be made.

This is a code system defined by the FHIR project.


Defining URL:

Data types allowed to be used for search parameters.

Committee:FHIR Infrastructure Work Group
OID:2.16.840.1.113883.4.642.1.12 (for OID based terminology systems)
Source ResourceXML / JSON

This Code system is used in the following value sets:

Data types allowed to be used for search parameters.

This code system defines the following codes:

number NumberSearch parameter SHALL be a number (a whole number, or a decimal).
date Date/DateTimeSearch parameter is on a date/time. The date format is the standard XML format, though other formats may be supported.
string StringSearch parameter is a simple string, like a name part. Search is case-insensitive and accent-insensitive. May match just the start of a string. String parameters may contain spaces.
token TokenSearch parameter on a coded element or identifier. May be used to search through the text, displayname, code and code/codesystem (for codes) and label, system and key (for identifier). Its value is either a string or a pair of namespace and value, separated by a "|", depending on the modifier used.
reference ReferenceA reference to another resource (Reference or canonical).
composite CompositeA composite search parameter that combines a search on two values together.
quantity QuantityA search parameter that searches on a quantity.
uri URIA search parameter that searches on a URI (RFC 3986).


See the full registry of value sets defined as part of FHIR.

Explanation of the columns that may appear on this page:

LvlA 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