UK Naming Systems

What is a NamingSystem?

A FHIR Naming System is a URL that acts as a well known "name" for the type of another concept, such as an NHS Number (an identifier) or a SNOMED CT code (terminology).

The name is a machine readable unique string for the scheme of an identifier or code system. When a concept is used in FHIR, such as an identifier in a Patient resource, there needs to be a way to show that it is from the set of NHS Numbers and not some other type of identifier. This concept type is a URL, that acts as a name, and it is used in identifier.system or coding.system. FHIR Naming System URLs are equivalent to OIDs used in earlier versions of HL7. OIDs can still be used but are deprecated for use in FHIR.

Naming System Index Tables

The index tables list the following information which is explained below:

Name A human readable name for the naming system
URL A URL that is carried in the coding.system element for NamingSystems of type terminology or identifier.system for Namingsystems of type identifier within a FHIR instance used for data exchange
Description The description of the naming system
Status The status of the naming system
  • active - a naming system that is still actively maintained
  • retired - a naming system that is no longer maintained, however is still useable with a FHIR instance for data exchange. For example, for historic information.
Kind The type of naming system which MUST be a value from:

This code system http://hl7.org/fhir/namingsystem-type defines the following codes:

CodeDisplayDefinition
codesystemCode SystemThe naming system is used to define concepts and symbols to represent those concepts; e.g. UCUM, LOINC, NDC code, local lab codes, etc.
identifierIdentifierThe naming system is used to manage identifiers (e.g. license numbers, order numbers, etc.).
rootRootThe naming system is used as the root for other identifiers and naming systems.



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