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A hierarchical view of a set of SNOMED CT concepts that is intended to assist navigation at the user interface.

There are several differences between navigation hierarchies and the formal subtype hierarchy

  1. Links between concepts in a navigation hierarchy are represented by an Ordered Reference Set
  2. Navigation links do not contribute to the semantic definitions of concepts. Therefore, the criteria for creating a navigation hierarchy can be based on arbitrary criteria relating to usability
  3. A navigation hierarchy may specify the order in which a set of concepts are to be displayed when nested under another specified concept.