A hierarchical view of SNOMED CT concepts that differs from the subtype hierarchy and enables an alternative way to locate and view part or all of the concept of SNOMED CT.

  • SNOMED CT enables navigation hierarchies to be specified using either:
    • an ordered association reference set in which the display order of nodes can be specified; or
    • an association reference set which the display order is not specified.
  • The links in a navigation hierarchy do not contribute in any way to the semantic definitions of the linked concepts.
  • navigation hierarchy may include navigation concepts which are created to represent nodes in the hierarchy exist only to organize the hierarchy and cannot be selected for data entry.
  • A navigation hierarchy may be limited to a subset of concepts relevant to a particular use case.
  • Many different navigation hierarchies can be created, each specifying a structure that meets the needs of a particular use case.

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