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NCI Thesaurus

NCI Thesaurus (NCIt) provides reference terminology for many NCI [National Cancer Institute] and other systems. It covers vocabulary for clinical care, translational and basic research, and public information and administrative activities. 

NCIt features:

  • Stable, unique codes for biomedical concepts;
  • Preferred terms, synonyms, definitions, research codes, external source codes, and other information;
  • Links to NCI Metathesaurus and other information sources;
  • Over 200,000 cross-links between concepts, providing formal logic-based definition of many concepts;
  • Extensive content integrated from NCI and other partners, much available as separate NCIt subsets
  • Updated frequently by a team of subject matter experts. 
General information
Vocabulary type: 
Current version date: 
Mon, 2013-08-12
Available formats: 
OWL download, searchable/browsable online
Was vocabulary created as a course project: 
Scope and Usage
Used By: 

NCIt is a widely recognized standard for biomedical coding and reference, used by a broad variety of public and private partners both nationally and internationally including the Clinical Data Interchange Standards Consortium Terminology (CDISC), the U.S. Food and Drug Administration (FDA), the Federal Medication Terminologies (FMT), and the National Council for Prescription Drug Programs (NCPDP).                      

Vocabulary characteristics
Type of display : 
Terms and Conditions
Licensing Options: 
Vocabulary provider name: 
National Cancer Institute (NCI)
Provider URL: 
Provider contact details: 

You can request help or make suggestions by filling out the online form (, or by using any one of these contact points: 

240-276-5541 or Toll-Free: 1-888-478-4423


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