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This is a synonym for Namespace identifier

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 forms part of the SCTID allocated every component that originated as part of an Extension. Therefore, it prevents collision between SCTIDs issued by different organizations. The namespace-identifier indicates the provenance of each SNOMED CT component.


Short format SCTIDs, which are used for components that originate in the International Release, do not include a namespace-identifier. In this case the partition identifier provides sufficient information about the origin of the component.


  • Extension namespace identifiers
  • NamespaceId