Current Build Code System

FHIR Infrastructure Work Group Maturity Level: 3Normative 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:

The mode of a RESTful capability statement.

Committee:FHIR Infrastructure Work Group
OID:2.16.840.1.113883.4.642.1.177 (for OID based terminology systems)
Source ResourceXML / JSON

This Code system is used in the following value sets:

The mode of a RESTful capability statement.

This code system defines the following codes:

client ClientThe application acts as a client for this resource.
server ServerThe application acts as a server for this resource.


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