# 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.

#### Notes

* 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.

## Alternatives

* **Namespace identifier**
* **NamespaceId**

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