Partition Identifier

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:

Partition identifier Values for Short Format SCTIDs

PartitionId	Component type
00	Concept
01	Description
02	Relationship

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

Partition identifier Values for Long Format SCTIDs

PartitionId	Component type
10	Concept
11	Description
12	Relationship
16	Postcoordinated Expression

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All other partition identifier values are reserved for future use.