This page is part of the US Core (v1.0.1: STU1) based on FHIR R3. The current version which supercedes this version is 5.0.1. For a full list of available versions, see the Directory of published versions
This page lists the Extensions defined as part of the US Core implementation Guide. A registry of standard extensions can be found in the FHIR specification and additional extensions may be registered on the HL7 FHIR registry at http://hl7.org/fhir/registry.