An expression is a structured combination of one or more concept identifiers used to represent a clinical meaning. SNOMED CT postcoordinated expressions enable clinical meanings to be represented, which cannot be represented using a single SNOMED CT concept. For example, the following postcoordinated expression represents 'pain in the left thumb:

SNOMED CT postcoordinated expressions allow analytics services to perform meaning-based queries over a more extensive set of clinical meanings than just individual concepts.

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