Directory / Terminology & standards / HDB-0076

UMLS

National Library of Medicine

HDB-0076

The Unified Medical Language System (UMLS) is a comprehensive repository of biomedical and health terminologies maintained by the National Library of Medicine, part of the NIH. It integrates over 100 medical vocabularies including SNOMED CT, LOINC, and RxNorm to enable interoperability and cross-referencing between different healthcare coding systems.

Category

Terminology

Access

Credentialed

Cost

Free (requires license agreement and annual survey)

Region

US

License / terms

Proprietary

Data types

medical terminology, vocabulary mapping, biomedical concepts

vocabulary integration medical ontology terminology mapping interoperability

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Record HDB-0076 · last verified 2026-08-05 · listed in Terminology & standards

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SNOMED CT

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LOINC

Regenstrief Institute LOINC is an international standard for identifying health observations, measurements, and laboratory tests maintained by the Regenstrief Institute at Indiana University. It enables healthcare systems to identify, exchange, and aggregate clinical data using unique standardized codes for laboratory and clinical observations. Terminology Open access HDB-0074

RxNorm

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WHO ICD-11

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