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The purpose of mapping between SNOMED CT and another code system is to provide a link between between  the code systems, to obtain a number of benefits. These may include:

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Caption table
Requirements for a set of maps between SNOMED CT and another code system

RequirementDescriptionExample UseReference Set

An equivalence map


A set of one-to-one bidirectional maps between SNOMED CT components and codes from another code system

Mapping legacy codes to equivalent SNOMED CT concepts Simple map reference set

A non-equivalence map

 

A set of maps from SNOMED CT concepts to codes in another code system, where the map may include:

  • one-to-many or many-to-one maps
  • map groups
  • map rules
  • map advice
Representing a map from SNOMED CT to a statistical classification Complex and extended map reference sets
A set of maps from another code system to SNOMED CT, where the map may include:
  • one-to-many or many-to-one maps
  • map groups
  • map rules
  • map advice
Representing a map from a statistical classification to SNOMED CT Complex and extended map reference sets
A set of links between codes in another code system and SNOMED CT expressionsRepresenting the link between LOINC codes and SNOMED CT Expressions Customized reference set