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Components within SNOMED Clinical Terms are identified and referenced using numeric identifiers. These identifiers have the data type SCTID ( SNOMED CT identifier).

The SCTID data type is 64-bit integer which is allocated and represented in accordance with a set of rules. These rules enable each identifier to refer unambiguously to a unique component. They also support separate partitions for allocation of identifiers for particular types of component and namespaces that distinguish between different issuing organizations.

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