For general EVS information or issues, contact a member of the EVS staff listed under About EVS

NCICB Application Support

Live telephone support is available Monday to Friday, 8 a.m. to 8 p.m. Eastern Time, excluding federal holidays.


Phone: 240-276-5541
Toll-free: 1-888-478-4423
Email: ncicbiit [at]

Distribution List

Up to date information and messages concerning the EVS are sent out to a distribution list hosted by the NIH. Please subscribe to the list at


The EVS Downloads page provides access to data files and supporting documentation for NCI Thesaurus, NCI Metathesaurus, and related resources. NCI Thesaurus is provided under an open content license. Download of the NCI Metathesaurus requires a valid UMLS license key.

The EVS FTP site provides direct file access to a variety of EVS data files and documentation also accessible through web page links elsewhere.