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About the UMLS
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FAQ
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Homepage
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License
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Support
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UMLS Quick Start Guide
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UMLS Reference Manual
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UMLS Terminology Services
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Implementation Resources
- MetamorphoSys
- MetaMap and MetaMap Transfer (MMTx)
- UMLS Applications
- UMLS Community
- UMLS Database Query Diagrams
- How to find all information associated with a particular UMLS concept (CUI value)
- How to find all information associated with a particular atom (AUI value)
- How to find all information associated with a particular source concept (SCUI value)
- How to find all information associated with the metadata of a particular atom (AUI value)
- How to find all information associated with the metadata of a particular relationship (RUI value) or attribute (ATUI value)
- How to perform searches for normalized strings, normalized words, or regular words
- How to perform searches in the UMLS history files (MRAUI.RRF and MRCUI.RRF)
- How to perform searches in the source history file (MRHIST.RRF)
- How to perform searches in the mapping files
- How to perform searches for root and versioned source metadata concepts
- How to perform searches for content view metadata concepts
- How to perform searches for subset metadata concepts
- UMLS Load Scripts
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Knowledge Sources
- Semantic Network
- SPECIALIST Lexicon and Lexical Tools
- Metathesaurus
- Forthcoming Releases
- UMLS Metathesaurus Source Evaluation Questions
- Release Documentation Archive
- Release Information
- Abbreviations Used in Data Elements
- Attribute Names
- Columns and Data Elements
- Content Views
- License Agreement
- New and Updated Sources
- New and Updated Sources - Expanded Representation Information
- Notes and Bugs
- Source and Term Types: Default Order of Precedence and Suppressibility
- Source Vocabularies
- Statistics
- UMLS Source Release Documentation
- Vocabularies in the UMLS Metathesaurus
Unified Medical Language System® (UMLS®)
UMLS Site Map
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Licensed Content Downloads
- RxNorm Files (including Current Prescribable Content)
- SNOMED CT Files
- SNOMED CT Release Files (International Release, Spanish Edition)
- SNOMED CT Archive Files
- CORE Problem List Subset of SNOMED CT
- Convergent Medical Terminology
- ICD-9-CM to SNOMED CT Map
- Nursing Problem List Subset of SNOMED CT
- ROA Subset of SNOMED CT
- SNOMED CT to ICD-10-CM Map
- UMLS enhanced VA/KP Problem List Subset of SNOMED
- US Extension to SNOMED CT
- UMLS Knowledge Sources: File Downloads
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Mapping Projects
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New Users
- Glossary
- Basics Tutorial
- Licensing Information
- Listserv
- Step-by-Step Instructions: Validate the UMLS Release files
- Step-by-Step Instructions: Install the Semantic Network
- Step-by-Step Instructions: Install the SPECIALIST Lexicon and Lexical Tools
- Step-by-Step Instructions: Create an English only SNOMED CT Metathesaurus subset
- UMLS Fact Sheets
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News
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RxNorm
- An Overview to RxNorm
- History and Publications
- NLM Research and Development using RxNorm
- RxNorm Current Prescribable Content
- Technical Documentation
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SNOMED CT
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User Education