Unified Medical Language System® (UMLS®)
Health Level Seven Vocabulary Source Information
The Health Level Seven (HL7) Vocabulary, Version 2.5, was developed by Health Level Seven International.
For more information about HL7 in the Metathesaurus, see the HL7 source synopsis.
Metathesaurus Update Frequency
HL7 was last updated in the Metathesaurus in 2005.