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Unified Medical Language System® (UMLS®)

2012AA Metathesaurus CPT Hierarchical Terms Source Information


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Term Type Description Count (MRCONSO.RRF)
HT Hierarchical term 1038


  • A term type indicates the role an atom plays in its source
  • An atom is the smallest unit of naming in a source; that is, a specific string with specific code values and identifiers from a specific source.
  • Every atom has a separate row in MRCONSO.RRF. Every atom is assigned a term type.
  • Term types are assigned based on source documentation or NLM understanding of the source.
  • Sample data are provided for every term type in the source (see below).
  • See Metathesaurus Documentation for a list of all term type abbreviations and their full names.
  • See Metathesaurus Documentation for a list of sources and their associated term types, listed in default order of precedence.
  • See Section 2.3 of the UMLS Reference Manual for more information on terms and term types in the UMLS Metathesaurus.

Sample Data


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C0519213 A13076856 L0699643 S0804102 Level 2: 01000-01190 Level 2: 01000-01190 Anesthesia for Surgical Procedures on the Pelvis (Except Hip)
C0519235 A13076473 L0859432 S1011123 Level 4: 12031-12057 Level 4: 12031-12057 Repair--Intermediate of the Integumentary System
C0519243 A13076475 L0762038 S0932253 Level 3: 16000-16036 Level 3: 16000-16036 Local Surgical Treatment of Burns
C0851312 A13078759 L0758816 S1038293 Level 3: 19000-19499 Level 3: 19000-19499 Surgical Procedures on the Breast
C0519251 A13076478 L3154900 S3677077 Level 4: 20100-20103 Level 4: 20100-20103 Wound Exploration--Trauma of the Musculoskeletal System (eg, Penetrating Gunshot, Stab Wound)
C0519257 A13077620 L0850732 S0910958 Level 4: 21010-21010 Level 4: 21010-21010 Incision of the Musculoskeletal System of the Head
C0407451 A13076868 L0790930 S0968974 Level 4: 22206-22226 Level 4: 22206-22226 Osteotomy on the Musculoskeletal System of the Spine (Vertebral Column)
C0519283 A13077625 L0856440 S0910963 Level 4: 23000-23044 Level 4: 23000-23044 Incision of the Musculoskeletal System of the Shoulder
C0519286 A13078404 L0872844 S1011117 Level 4: 23395-23491 Level 4: 23395-23491 Repair, Revision, and/or Reconstruction on the Musculoskeletal System of the Shoulder