Details
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Change Request
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Resolution: Not Persuasive
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Medium
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FHIR Core (FHIR)
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R4B
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Modeling & Methodology
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Datatypes
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2.24.0.13 Identifier
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Lloyd McKenzie / Rob Hausam: 2-0-0
Description
Identifier.type has an extensible binding to the value set IdentifierType.
It is unclear when a code in the value set IdentifierType applies to an identifier. This is important as when one does, one must be sent together with any local code.
An example of this obscurity is with the code LACSN from code system http://terminology.hl7.org/CodeSystem/v2-0203.
Must LACSN be sent with ACSN from the value set IdentifierType as another coding? It looks as if this is true (See Zulip), but there is an 8-year old decision that all v2 code systems are flat. See https://jira.hl7.org/browse/UP-331.
This flatness and its impact on using Identifier.type needs to be documented in the value set IdentifierType and in the documentation of Identifier.type.