This code system http://hl7.org/fhir/identifier-use defines the following codes:

CodeDisplayDefinition
usualUsualThe identifier recommended for display and use in real-world interactions.
officialOfficialThe identifier considered to be most trusted for the identification of this item.
tempTempA temporary identifier.
secondarySecondaryAn identifier that was assigned in secondary use - it serves to identify the object in a relative context, but cannot be consistently assigned to the same object again in a different context.

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