Welcome to UMLS Terminology Services (UTS). Your UTS account provides access to the Unified Medical Language System (UMLS), the Value Set Authority Center (VSAC), RxNorm downloads, SNOMED CT downloads and more.

Unified Medical Language System (UMLS)

A set of files and software that brings together many health and biomedical vocabularies and standards to enable interoperability between computer systems.

Value Set Authority Center (VSAC)

A repository and authoring tool for standard lists of codes and terms from biomedical vocabularies.

RxNorm

RxNorm provides normalized names for clinical drugs and links its names to many of the drug vocabularies commonly used in pharmacy management and drug interaction software.

SNOMED CT

SNOMED CT is one of a suite of designated standards for use in U.S. Federal Government systems for the electronic exchange of clinical health information.