i-CLASSi Lookup
Expand the classification from L1 to L6. Terminal branches open disease details, mapped UMLS CUIs, public UMLS source content, and optional licensed live lookup.
Click an L5 entity or L6 subtype in the tree to view the classification record.
Some material in the UMLS Metathesaurus is from copyrighted sources of the respective copyright holders. Users of the UMLS Metathesaurus are solely responsible for compliance with any copyright, patent or trademark restrictions and are referred to the copyright, patent or trademark notices appearing in the original sources, all of which are hereby incorporated by reference.
UMLS Metathesaurus data © U.S. National Library of Medicine. Cached public content is source-attributed and integrated into the i-CLASSi classification.
The cached section is limited to selected CUI, AUI, names, source codes, term metadata, and definitions from MSH, NCI, HPO, MEDLINEPLUS, ORPHANET, and PDQ. Category 3/restricted sources are excluded from the public interface. Additional UMLS metadata is retrieved live using the visitor’s own UMLS API key and is not added to the public i-CLASSi dataset.
Definition cache policy is loading.
Public UMLS content will appear here after selecting a mapped CUI.
Retrieve additional UMLS metadata using your own API key.
Your API key is used only for the current lookup session. i-CLASSi does not intentionally store your key or the returned live UMLS metadata. Your use remains subject to your UMLS licence and the restrictions of the original vocabulary sources.
Select an i-CLASSi terminal branch to enable live lookup for its mapped CUI.
No live UMLS response has been retrieved in this browser session.