This is an abbreviation for extension namespace identifier.

extension namespace identifier

A seven digit number allocated by SNOMED International to an organization that is permitted to maintain a SNOMED CT Extension.


  • The namespace identifier enables an authorized organization to generate a unique SNOMED CT identifier (SCTID) for each of their SNOMED CT components. It forms part of the SCTID assigned to every component created by that organization.
  • Short format SCTIDs, which are used for components that originate from SNOMED International, do not include a namespace identifier. For these SCTIDs the partition identifier provides sufficient information about the origin of the component.


  • Namespace identifier
  • NamespaceId

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