Delirium, delirious (acute or subacute) (not alcohol- or drug-induced) is a main term in the FY2027 ICD-10-CM Alphabetic Index (Index to Diseases and Injuries). The Index lists R41.0 for the term on its own. It has 76 subterms and 56 code entries. First-level subterms include with, alcoholic, due to, exhaustion, hysterical, postprocedural, puerperal, thyroid and more. Confirm any code you find here in the Tabular List before you report it.