Alphabetic Index · main term
Pyrexia (of unknown origin)
At the main termR50.9
Pyrexia (of unknown origin) is a main term in the FY2027 ICD-10-CM Alphabetic Index (Index to Diseases and Injuries). The Index lists R50.9 for the term on its own. It has 7 subterms and 8 code entries. First-level subterms include atmospheric, during labor NEC, heat, newborn, persistent, puerperal. Confirm any code you find here in the Tabular List before you report it.