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National Library of Medicine Technical BulletinNational Library of Medicine Technical Bulletin

Table of Contents: 2017 MAY–JUNE No. 416

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UMLS 2017AA Release Available

Wilder V. UMLS 2017AA Release Available. NLM Tech Bull. 2017 May-Jun;(416):e1.

2017 May 09 [posted]

The 2017AA release of the Unified Medical Language System (UMLS) Knowledge Sources is available for download as of May 8, 2017.

The 2017AA Metathesaurus contains approximately 3.47 million concepts and 13.5 million unique concept names from 201 source vocabularies.

Two new NCI sub-sources:

  1. NCI_GAIA (Global Alignment of Immunization Safety Assessment in pregnancy)
  2. NCI_PI-RADS (Prostate Imaging Reporting and Data System)

CVX and DrugBank now are included as part of RxNorm.

The Metathesaurus includes the SPECIALIST Lexicon and Lexical Tools 2017 Releases.

Fifty-eight English sources and 41 translation sources were updated. These include MeSH, MedDRA, RxNorm, and SNOMED CT (English and Spanish). A complete list is available in the Updated Sources section of the Release Documentation. For more detailed information on changes in this version of the Metathesaurus, see the Updated Sources (Expanded) section. Additional release statistics may be found in the Statistics section.


  • The full release requires 26.6 GB of disk space.
  • The active release requires 25.9 GB of disk space.

Reported bugs may be viewed on the Release Notes and Bugs Web page.

MetamorphoSys can generate custom load scripts for MySQL, Oracle, or Microsoft® Access when creating a Metathesaurus subset or installing the Semantic Network. Instructions are available on the UMLS Load Scripts homepage.

Release Information
To access the UMLS Release files, you must have an active UMLS Metathesaurus License and a valid UTS account. You will be prompted for your UTS username and password when downloading the files.

UMLS Learning Resources
2017AA Source Release Documentation Web pages will be published following the release.

Additional information regarding the UMLS is available on the UMLS homepage. New users are encouraged to take the UMLS Basics Tutorial and to explore the UMLS Quick Start Guide, and other training materials.

By Victoria Wilder
MEDLARS Management Section

NLM Technical Bulletin National Library of Medicine National Institutes of Health