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


  1. The namespace identifier enables an authorized organization to generate a unique identifier (SCTID) for every SNOMED CT component that they create. It forms part of the SCTID assigned to every component that is created by the organization to which it is allocated. Therefore the namespace identifier indicates the provenance of each SNOMED CT component.
  2. 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.


  • Extension namespace identifiers
  • NamespaceId

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