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| Requirement | Description | Example Use | Reference 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:
| 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:
| 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 expressions | Representing the link between LOINC codes and SNOMED CT Expressions | Customized reference set |
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