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Current Version - Under Revision

SNOMED CT specifications and content include resources that support Mapping to and from other code systems, classifications and terminologies. These resources support simple mapping, where there is a one-to-one Relationship between a SNOMED CT concept and code in a target scheme , and more complex maps where these are required.

More complex mapping requirements supported by the SNOMED CT Mapping model include:

  • Maps from a single SNOMED CT concept to a combination of codes (rather than a single code) in the target scheme.
  • Maps from a single SNOMED CT concept to choice of codes in the target scheme. In this case, the resolution of the choices may involve:
    • Manual selection supported by advisory notes.
    • Automated selection based on rules that test other relevant characteristics in the source data (e.g. age and sex of the subject, presence or absence of co-existing conditions, etc).
    • A combination of automated processing with manual confirmation or selection where rules are insufficient to make the necessary decisions.

In Release Format 2Maps are represented using Reference Sets. The type of Reference Set used varies according to the nature and complexity of the mapping, there is a Simple Map Reference Set and a Complex Map Reference Set.

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