A structured combination of one or more concept identifiers used to express a clinical idea.

An expression containing a single concept identifier is referred to as a precoordinated expression. An expression that contains two or more concept identifiers is a postcoordinated expression.
The concept identifiers in a postcoordinated expression are related to one another in accordance with rules expressed in the SNOMED CT Concept Model.
These rules allow an expression to refine the meaning of a concept by applying more specific values to particular attributes of a more general concept.

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