UMLS 2013AA Release Available

The 2013AA release of the Unified Medical Language System (UMLS) Knowledge Sources is available for download as of May 6, 2013.

In the new UMLS Release there are:

• More than 2.9 million concepts and 11.4 million unique concept names from over 160 source vocabularies; the full Metathesaurus requires xx GB of disk space
• Four new sources
  • Ages & Stages Questionnaire (LNC_ASQ_3)
  • Pressure Ulcer Stages (LNC_NPUAP)
  • Veterans RAND 12 Item Health Survey VR-12 (LNC_VR_12)
  • Source of Payment Typology (SOP)
• One new content view
  • RxNorm Current Prescribable Content Subset
• 44 updated English sources and 20 updated translation sources including MeSH, MedDRA, RxNorm, and SNOMED CT (English and Spanish)
• SPECIALIST Lexicon and Lexical Tools 2013 Releases

Data Changes

• Some fields in the RRF files have changed their allowable character length, which could affect those loading the Metathesaurus into a database. See the full list of changes for details.
• 2013AA is the last release that will include the co-occurrences files: MRCOC.RRF and MRCOC (ORF format). Co-occurrence information will remain on the NLM Web site; more details will be provided with the 2013AB release in November.

Logical Observation Identifier Names and Codes (LOINC)

• The representation of LOINC (SAB=LNC) in the Metathesaurus does not include the following content:
  • Borderline Symptom List-23
  • Borderline Symptom List-Supp
  • Edinburgh Postnatal Depression Scale
  • Patient Reported Outcomes Measurement (PROMIS)
  • Test of Infant Motor Performance (TIMP)

Release Information
For more information about the release, see the What's New and Updated Sources sections of the Release Documentation.  Additional release statistics are published on the UMLS Web site.

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. 

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 new UMLS Quick Start Guide, training materials and other information on the New Users' homepage.

Source Release Documentation
2013AA Source Release Documentation Web pages will be published following the release.