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UMLS API boundary

Official-source access, authentication, request-shaping, freshness, legal, and interpretation boundaries for UMLS API.

version 1.0.0freshness currentobserved 2026-08-28T15:06:26Z

resource.public-data.umls-api
sha256:21d0841d00f51925538f439368be678544c9833a191a1b9d682d198af46bacc5

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Evidence-backed facts

  1. The UMLS REST API exposes concepts, atoms, source vocabularies, definitions, relations, semantic types, crosswalks, and search over licensed terminology content. informative
  2. Requests require a UTS account and API key and remain subject to source-vocabulary licenses; credentials and restricted content must not be embedded in public resource records. informative
  3. Clients must bind release, source vocabulary, identifier, search type, language, page number, page size, and relation scope and respect license and rate requirements. informative
  4. UMLS aggregation and mappings can contain ambiguity, source disagreement, historical terms, and licensing limits and do not prove clinical equivalence, diagnosis, code validity, or treatment suitability. informative