The unified medical language system (UMLS): integrating biomedical terminology
Open accessAbstract
The Unified Medical Language System (http://umlsks.nlm.nih.gov) is a repository of biomedical vocabularies developed by the US National Library of Medicine. The UMLS integrates over 2 million names for some 900,000 concepts from more than 60 families of biomedical vocabularies, as well as 12 million relations among these concepts. Vocabularies integrated in the UMLS Metathesaurus include the NCBI taxonomy, Gene Ontology, the Medical Subject Headings (MeSH), OMIM and the Digital Anatomist Symbolic Knowledge Base. UMLS concepts are not only inter-related, but may also be linked to external resources such as GenBank. In addition to data, the UMLS includes tools for customizing the Metathesaurus (MetamorphoSys), for generating lexical variants of concept names (lvg) and for extracting UMLS concepts from text (MetaMap). The UMLS knowledge sources are updated quarterly. All vocabularies are available at no fee for research purposes within an institution, but UMLS users are required to sign a license agreement. The UMLS knowledge sources are distributed on CD-ROM and by FTP.
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UMLS relations are sometimes overlapping in meaning (e.g., cause of and has causative agent both map to cause).
“as UMLS relations are sometimes overlapping in meaning (e.g., cause of and has causative agent both map to cause).”
From Crowdsourcing Ground Truth for Medical Relation Extraction (2018) · cites this paper as [6]
The Terminology integration principles section describes several kinds of UMLS relationships, including ‘caused by,’ but does not say that relationship meanings overlap. Searches for ‘cause of,’ ‘has causative agent,’ and equivalent causal-relation mappings found no passage supporting the specific example. (LLM, conf=0.72)
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Koukaras, P., & Tjortjis, C. (2025) · Big Data and Cognitive Computing · doi:10.3390/bdcc9100258 · Cited by 3 · see citing works
Joint extraction of entity and relation based on fine-tuning BERT for long biomedical literatures
Gao, T., Zhai, X., Yang, C., Lv, L., & Wang, H. (2024) · Bioinformatics Advances · doi:10.1093/bioadv/vbae194 · Cited by 2 · see citing works
Ariño, H., Bae, S. K., Chaturvedi, J., Wang, T., & Roberts, A. (2023) · Frontiers in Digital Health · doi:10.3389/fdgth.2023.1085602 · Cited by 2 · see citing works
Multimodal Artificial Intelligence for Precision Critical Care: A Scoping Review
Yang, M., Shi, N., Chen, H., Po, E. Y. P., Ng, P. Y., Lai, P. C. K., Wu, Y.-C., & Fong, D. Y. T. (2026) · Health Data Science · doi:10.34133/hds.0356 · Cited by 3 · see citing works
“…[ 37 ] (trained on PubMed database), ClinicalBERT [ 40 , 41 , 45 , 47 , 49 , 86 – 88 ] (trained on MIMIC-III database [ 81 ]), and SapBERT [ 87 ] (trained on the Unified Medical Language System database [ 89 ]), have been used to enhance representation learning for downstream clinical tasks.”
Liu, X., Chen, Y.-W., Xu, X., Smith, D., & Fan, F. (2026) · Toxicological Sciences · doi:10.1093/toxsci/kfag021 · Cited by 1 · see citing works
- Authors
- Bodenreider, O.
- Affiliations
- National Institutes of Health (US)
- Corresponding author
- Bodenreider, O.
- ORCID
- Bodenreider, O.
- Venue
- Nucleic Acids Research
- Publisher
- Oxford University Press (OUP)
- Published
- 2004-01-01
- Volume
- 32
- Issue
- 90001
- Pages
- 267D-270
- ISSN
- 0305-1048 (ISSN-L)
- 1362-4962
- PMC
- PMC308795
- OpenAlex
- W2159583324
- Cited by
- 4,356
- References
- 11
- Citations by year
- 2026: 289 · 2025: 313 · 2024: 316 · 2023: 338 · 2022: 330 · 2021: 338 · 2020: 352 · 2019: 286 · 2018: 218 · 2017: 210 · 2016: 191 · 2015: 186 · 2014: 172 · 2013: 169 · 2012: 150
- FWCI
- 9.37
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Nucleic Acids Research (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (Z99 LM999999)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biomedical Text Mining and Ontologies
- Physical Sciences › Computer Science › Artificial Intelligence › Semantic Web and Ontologies
- Physical Sciences › Computer Science › Information Systems › Library Science and Information Systems
- Keywords
- UMLS, UMLS Metathesaurus, biomedical terminology, vocabulary integration, NCBI taxonomy, Gene Ontology, Medical Subject Headings, OMIM, MetaMap, lexical variants, National Library of Medicine
- MeSH terms
- Animals, Humans, Licensure, Molecular Biology, National Library of Medicine (U.S.), Terminology as Topic, Software, Subject Headings, United States, Databases, Factual, Information Storage and Retrieval, Neurofibromatosis 2, Unified Medical Language System, Computational Biology, Internet, Databases, Genetic, Biomedical Research
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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