ConceptMapEquivalence

The degree of equivalence between concepts.

This value set has an inline code system http://hl7.org/fhir/concept-map-equivalence, which defines the following codes:

Lvl	Code	Display	Definition
1	equivalent	Equivalent	The definitions of the concepts mean the same thing (including when structural implications of meaning are considered) (i.e. extensionally identical).
2	equal	Equal	The definitions of the concepts are exactly the same (i.e. only grammatical differences) and structural implications of meaning are identical or irrelevant (i.e. intentionally identical).
1	wider	Wider	The target mapping is wider in meaning than the source concept.
1	subsumes	Subsumes	The target mapping subsumes the meaning of the source concept (e.g. the source is-a target).
1	narrower	Narrower	The target mapping is narrower in meaning that the source concept. The sense in which the mapping is narrower SHALL be described in the comments in this case, and applications should be careful when attempting to use these mappings operationally.
1	specializes	Specializes	The target mapping specializes the meaning of the source concept (e.g. the target is-a source).
1	inexact	Inexact	The target mapping overlaps with the source concept, but both source and target cover additional meaning, or the definitions are imprecise and it is uncertain whether they have the same boundaries to their meaning. The sense in which the mapping is narrower SHALL be described in the comments in this case, and applications should be careful when attempting to use these mappings operationally.
1	unmatched	Unmatched	There is no match for this concept in the destination concept system.
2	disjoint	Disjoint	This is an explicit assertion that there is no mapping between the source and target concept.