Unified Medical Language System (UMLS) is a set of files and software that brings together many health and biomedical vocabularies and standards to enable interoperability between computer systems.

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Interoperability between health computer systems relies on a single framework that links multiple vocabularies and coding schemes. The Unified Medical Language System is exactly that: a set of files and software designed to bring together many health and biomedical vocabularies so different systems can understand each other.

UMLS includes the Metathesaurus, which maps terms across vocabularies (like SNOMED CT, ICD, and LOINC) under common concepts and provides synonyms and concept identifiers. It also features a Semantic Network that defines broad concept types and the relationships between them, plus Knowledge Sources that feed these mappings. This combination makes it possible to translate and relate data from diverse coding schemes, supporting semantic interoperability, information retrieval, and clinical decision support.

The other options don’t fit this purpose. PACS is about storing and displaying medical images, videoconferencing is a communication method for remote encounters, and USAC isn’t a standard term tied to integrating medical vocabularies.