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The penultimate two-digits of the SCTID (second and third from the right), are the partition-identifier.

The partition-identifier indicates the nature of the component identified. This allows the Identifier of a Description to be distinguished from the Identifier of a Concept.

The partition-identifier also indicates whether the SCTID contains a namespace-identifier( long format) or follows the short format applicable to Identifiers of components that originated in the International Release. Identifiers of components that originated in the International Release of SNOMED CT have one of the following partition-identifier values:

Table 5.5-1: partition identifier Values for Short Format SCTIDs

Identifiers of components that originated in an Extension have one of the following partition identifier values:

Table 5.5-2: partition identifier Values for Long Format SCTIDs

All other partition-identifier values are reserved for future use.


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