NCI Thesaurus (NCIt) provides reference terminology for many NCI 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. 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).


  • US National Health Institute

Tools that support its use

  • There are no Tools supported by this vocabulary