We will add links to FHIR extensions for which a permanent link exists. We will add links to specific versions of USCDI mentioned  We will add a link to current US Core IG Links should be added where text is shown in red below For gender identity, there are several extensions that exist: patient-genderIdentity : This extension is available in versions of FHIR prior to R5. In R5, it was replaced by individual-genderIdentity, as the scope of gender identity includes non-patient persons such as practitioners. individual-genderIdentity : This extension replaced patient-genderIdentity, and is available in R5. In addition to expanding the scope to individuals other than the patient, it also added support for metadata such as a period of applicability and a comment. us-core-genderIdentity : This extension was created by US Core to meet US-specific value set requirements which were not satisfied by the R4 patient-genderIdentity extension. In the US, Sex assigned at Birth is part of the USCDIv1 . There are two extensions that may be considered for communicating this concept: us-core-birthsex : This extension was created by US Core to meet US-specific requirements. individual-recordedSexOrGender : This extension was created by the Gender Harmony Project as a generic option for recording any sex or gender concept that does not have a more specific field or extension.