Release Documentation Archive

Current Release Documentation - 2009AB
Note: As of the 2009AA UMLS Release, general reference information is available as the UMLS Reference Manual. Information specific to a UMLS Release, such as sources included in the current version of the Metathesaurus and statistics regarding the number of concepts, remains on the UMLS Web site as part of the Release Documentation.

Current UMLS License Agreement

Previous Release Bugs

Previous UMLS Releases

PDF documents require the use of the Adobe® Acrobat® Reader, which can be downloaded from Adobe's Web site at no charge.