Unified Medical Language System
The Unified Medical Language System (UMLS) integrates and distributes over 200 biomedical vocabularies, terminologies, and classification standards to enable interoperability between information systems. It includes the Metathesaurus (terms and codes from vocabularies like CPT, ICD-10-CM, LOINC, MeSH, RxNorm, SNOMED CT), Semantic Network (broad categories and relationships), and SPECIALIST Lexicon (biomedical and general English lexicon with normalization tools).
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