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SNOMED CT is a multilingual clinical terminology that covers a broad scope. However, some users may need additional concepts, relationships, descriptions or reference sets to support national, local or organizational needs. SNOMED CT is designed to allow the International Edition to be enhanced by creating extensions that meet national or local requirements. The extension mechanism allows SNOMED CT to be customized to address the terminology needs of a country or organization that are not met by the International Edition. An extension may contain components (i.e.  concepts, descriptions or relationships) and/or derivatives (e.g. reference sets used to represent subsets, maps or language preferences).

SNOMED CT extensions can support a variety of use cases, including:

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