This page is part of the FHIR Specification (v4.3.0: R4B -  STU). This is a downloaded version of the specification.  For a full list of available versions, see the Directory of published versions 
FHIR Infrastructure   Work Group | Maturity Level: N/A | Standards Status: Informative | 
The extensions defined here can be used on any element. 
For background information, see Extensibility.
Additional extensions may be found in published
Implementation Guides 
, or in the
Conformance resource registry 
.