Unified Medical Language System® (UMLS®)
HL7 Vocabulary Version 2.5, 7-bit equivalents created by the National Library of Medicine Source Information
This is the 7-bit equivalents of the Health Level Seven (HL7) Vocabulary, Version 2.5.
For more information about HL7 in the Metathesaurus, see the HL7, Version 3.0, source synopsis.
Metathesaurus Update Frequency
This source was last updated in the Metathesaurus in 2005.