UMLS® 2019AB Release Available

The 2019AB release of the Unified Medical Language System® (UMLS) Knowledge Sources is available for download as of November 4, 2019.

The available downloads are:

• Full Release (UMLS Metathesaurus, Semantic Network, Specialist Lexicon and Lexical Tools, database load scripts, and MetamorphoSys for customizing your UMLS subset and browsing the data)
• UMLS Metathesaurus Files (complete Metathesaurus data without any customization)

• MRCONSO.RRF file (most widely used Metathesaurus file

Metathesaurus

The 2019AB Metathesaurus contains approximately 4.26 million concepts and 15.2 million unique concept names from 211 source vocabularies.