Unified Medical Language System (UMLS ® ) ®
Vocabulary Standards and Mappings Downloads
Files marked with an asterisk (*) require a UMLS username and password for download access.
UMLS Release Name
UMLS Release Description
UMLS Knowledge Sources* Current Release; archives dating from 2002. Includes Semantic Network, SPECIALIST Lexicon, and SPECIALIST Lexical Tools.
Semantic Network Open source resource that includes semantic types and semantic relations for categorizing terminologies
SPECIALIST Lexicon Open source lexicon of biomedical and general English
SPECIALIST Lexical Tools Open source set of Java programs that manage lexical variation in biomedical text
SNOMED CT Files
SNOMED CT Release Name
SNOMED CT Release Description
SNOMED CT* International Release (RF1 and RF2 version, RF1 compatibility tools) including ICD-9-CM Cross Map; ICD-10 Cross Maps; Spanish Edition; archives dating from 2007
US Edition of SNOMED CT* Combines the SNOMED CT International Release and
US Extension to SNOMED CT (terminology content accepted by the NLM as a formal extension to the International Release)
Nursing Problem List Subset of SNOMED CT* SNOMED CT encoded Nursing Problem List Subset
CORE Subset of SNOMED CT* Clinical Observations Recording and Encoding Subset of SNOMED CT
ROA Subset of SNOMED CT* Route of Administration Subset of SNOMED CT
Convergent Medical Terminology (CMT)* Kaiser Permanente is donating their CMT terminology content and related tooling to the IHTSDO in phases. Available items include: Mental Health Subset, Cardiology Problem List Subset, Top 2500 Problem List Subset.
RxNorm Release Name
RxNorm Release Description
including Current Prescribable Content Weekly and monthly RxNorm releases; monthly RxNorm Current Prescribable Content releases; archives dating from 2005