4.11 Identifier Capabilities

Publish identifier namespaces the endpoint actually produces, recognizes, or requires for matching and correlation. Do not publish a generic list merely because an identifier type appears elsewhere in the guide.

Identifier role	Namespace	Produce	Recognize	Required
Patient / Person	Endpoint-specific	Yes / No	Yes / No	Yes / No
Organization	Endpoint-specific	Yes / No	Yes / No	Yes / No
Provider	NPI and/or other	Yes / No	Yes / No	Yes / No
Visit Context Instance	Applicable namespace	Yes / No	Yes / No	Yes / No
Perinatal Context Instance	Applicable namespace	Yes / No	Yes / No	Yes / No
Request Context Instance	Applicable namespace	Yes / No	Yes / No	Yes / No