Which resource is a statement of relationships from one set of concepts to one or more other concepts - either concepts in code systems, or data element/data element concepts, or classes in class models?

• A. CodeSystem
• B. ValueSet
• C. ConceptMap
• D. NamingSystem

Answer: (C)

A ConceptMap is used to articulate mappings from one set of concepts to one or more concepts in other sets, whether those are codes in code systems, data element concepts, or classes in a model. It captures how a source concept relates to target concepts and supports one-to-one, one-to-many, or many-to-one relationships, with notes on equivalence or other mapping rules. This is exactly what a statement of relationships across concept sets is intended to express. CodeSystem defines the codes and their meanings, but not mappings to other concepts. ValueSet is a selected collection of codes used for data elements, not a cross-map. NamingSystem covers identifiers and registration details for systems, not concept-to-concept relationships.