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Introduction
See also Information technology topics | Medical Subject Headings (MeSH)
The Unified Medical Language System® (UMLS) is produced by the National Library of Medicine (U.S.). The UMLS is a compendium of controlled vocabularies for the biomedical sciences, mapping among these vocabularies and helping users to translate one ontology with another. It provides a way to process natural language and is used by developers of medical systems of all types including electronic patient record companies. The UMLS plays a role in the semantic web and in translating ontologies in a large framework. NLM produces the UMLS Knowledge Sources (databases) and software (programs) to retrieve, integrate and aggregate biomedical data. These sources are applied to a range of functions such as patient records, scientific literature, guidelines and public health information. New software tools assist developers in customizing knowledge sources; the lexical tools work most effectively with the Knowledge Sources but can be used independently.
Three (3) UMLS Knowledge Sources
All three sources are distributed with flexible tools and the MetamorphoSys installation program. For more information, see the NLM Factsheet - Unified Medical Language System and the NLM Technical Bulletin, Unified Medical Language System (UMLS) News http://www.nlm.nih.gov/pubs/techbull/ma10/ma10_umls_news.html.
What does UMLS contain?
- ~150 controlled vocabularies in biomedicine
- More than 2.1 million concepts and 9.8 million unique concept names
- New sources:
- Routine Health Outcomes (LNC_RHO)
- CORE (Clinical Observations Recording and Encoding) Problem List Subset of SNOMED
- New mapping file:
- ICD10PCS_2009 to ICD9CM_2009 Mappings (Reimbursement)
- Twenty-nine English sources and nine translation sources including MeSH®, MedDRA, RxNorm, and SNOMED CT (English and Spanish). For a list of updated sources, see the Updated Sources page. For detailed information on changes in this version of the Metathesaurus, see the Updated Sources (Expanded) Web page.
- RxNorm data changes including adding the term type PIN (Precise Ingredient Name) and changes to the term type SY (Synonym)
References
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