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New guide in development

The components of an extension have identifiers ( SCTIDs) which have the same structure as those used in the SNOMED CT International Release. However, these identifiers include a partition-identifier indicating that the component is part of an extension and a namespace identifier specific to the responsible organization .

Partition-identifiers and namespace identifiers serve two roles:

  • Prevention of identifier collision or reuse:
  • Indicating the origin of an identified component:
    • If an application receives instance data containing an identifier that it does recognize, the application can use the namespace identifier to determine the responsible issuing organization .
    • The responsibility for an allocated namespace remains with the organization to which it was issued unless responsibility is transferred by merger or mutual agreement. Any namespace transfer must be notified to and authorized by SNOMED International .