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Maps are represented as reference sets, which are either of type simple, complex and extended map reference sets. Special cases may also occur, which require a customized reference set to represent the map. An example of this is the
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ShowParts | term , which is used to link LOINC Terms to SNOMED CT expressions. The standard reference set format do not support maps to SNOMED CT expressions. Hence, the type of map reference set to use depends on the features that need to be supported by the map.
Simple map reference sets support mapping SNOMED CT codes to a single code or a combination of codes in a target code system. However simple maps are usually only appropriate where there is an equivalent map between SNOMED CT and the values in the other code system.
Complex and extended map reference sets enable the representation of:
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The figure below shows an except of some of the reference sets for maps between SNOMED CT and other code systems, which are available with the International Edition of SNOMED CT. However, local maps may also be developed and applied as part of an Extension to SNOMED CT.
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| CapId | excerpt-of-mappings-in-the-snomed-ct-international-edition |
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Excerpt of mappings in the SNOMED CT International Edition |