Current Version - Under Revision
In some cases, during or after the merger of SNOMED RT and NHS Clinical Terms Version 3 some concept in SNOMED RT were found to be ambiguous or duplicated. Even in these cases the concepts with original identifier are still present in the SNOMED CT Concepts Table but have been inactivated. Records in the Concept Inactivation Reference Set indicate the reason for inactivation and records in the appropriate Historical Association Reference Set can be used to locate the appropriate active concept identifier.
For information about historical reference sets please see the following:
These Associations can be used either to allow concepts recorded using these identifiers to be recognized by retrieval tools or to enable mapping of the stored information to the appropriate active concepts.
If any storedConcept Identifier
of anInactive Concept
is mapped to anactive Concept Identifier
using these Associations it is strongly recommended that the originalConcept Identifier
is also retained. This enables future improvements or corrections of such mappings if revised Associations are present in a future release ofSNOMED CT
In addition,SNOMED RT
contained both generic and brand name drugs for the US. A decision was made during the merger process to not retire theseconcepts
mechanisms, but to place these components directly in the US DrugExtension
. Therefore to access allSNOMED RT components
you will need to use the US DrugExtension
in addition to theSNOMED CT International Release
also contains the appropriate legacy SNOMEDID fromSNOMED International