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Unified Medical Language System® (UMLS®)

2012AB Master Drug Data Base Source Information


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Term Type Description Count (MRCONSO.RRF)
CD Clinical Drug 13105


  • 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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C0973766 A1685234 L1436295 S1720954 24894 Acetaminophen Liquid 167 MG/5ML
C0973825 A1686872 L1437866 S1722586 13700 Acyclovir Susp 200 MG/5ML
C0687790 A1693166 L1444039 S1728856 13698 Acyclovir Tab 800 MG
C1177313 A2648715 L2535779 S2992240 26530 Aloe Vera Cap 25 MG
C0687859 A1686476 L1437476 S1722190 06088 Aminohippurate Sodium Inj 20%
C0779559 A1693955 L1444793 S1729637 15611 Baclofen Powder
C0783806 A1694082 L1444911 S1729762 04197 Bioflavonoid Products Tab CR
C0691275 A1692808 L1443691 S1728501 04345 Calcium Lactate Tab 650 MG
C0304097 A2649075 L0536085 S2992600 28342 Caraway Oil