Demographics and other administrative information about an individual or animal receiving care or other health-related services.

Tracking patient is the center of the healthcare process.

An identifier for this patient.

Patients are almost always assigned specific numerical identifiers.

Establishes the namespace in which set of possible id values is unique.

There are many sequences of identifiers. To perform matching, we need to know what sequence we're dealing with. The system identifies a particular sequence or set of unique identifiers.

urn:oid: 2.16.840.1.113883.2.1.4.1

urn:fhir.nhs.uk:id/NHSNumber

The portion of the identifier typically displayed to the user and which is unique within the context of the system.

If the value is a full URI, then the system SHALL be urn:ietf:rfc:3986.