# SNOMED CT — Systematized Nomenclature of Medicine Clinical Terms ## Overview SNOMED CT is a comprehensive clinical healthcare terminology maintained by SNOMED International. It contains over 350,000 active concepts as of 2024, covering diseases, clinical findings, procedures, body structures, substances, organisms, and observable entities, all described with formal, machine-readable definitions and organised in a polyhierarchical structure. It was first released in 2002 from the merger of SNOMED RT (College of American Pathologists) and Clinical Terms Version 3 (UK NHS). ## Concept Model SNOMED CT uses a description logic model in which concepts are formally defined by typed relationships to other concepts. Each concept has a unique numeric SCTID, human-readable descriptions (Fully Specified Name, Preferred Term, Synonyms), and IS-A and attribute relationships that define its meaning and position in the hierarchy. ## Connections - endorsedBy: [[EHDS]] - correspondsWith: [[ICD-10]] - correspondsWith: [[ICD-11]] - relatedTo: [[ANS]] (ANS is the French National Release Centre responsible for SNOMED CT in France) ## Resources - https://www.snomed.org - https://browser.ihtsdotools.org (SNOMED CT browser) - https://www.snomed.org/snomed-ct/get-snomed (licensing and national releases) - https://esante.gouv.fr/terminologies (ANS, French NRC)