Pyrexia (of unknown origin) - in the ICD-10-CM Index
Annotation Back-References in the 2025 ICD-10-CM Index to Diseases and Injuries
Browse the ICD-10-CM codes with references applicable to the clinical term "pyrexia (of unknown origin)"
Pyrexia (of unknown origin) - R50.9 Fever, unspecified
atmospheric - T67.01 Heatstroke and sunstroke
during labor NEC - O75.2 Pyrexia during labor, not elsewhere classified
heat - T67.01 Heatstroke and sunstroke
newborn - P81.9 Disturbance of temperature regulation of newborn, unspecified
environmentally-induced - P81.0 Environmental hyperthermia of newborn
persistent - R50.9 Fever, unspecified
puerperal - O86.4 Pyrexia of unknown origin following delivery
Applicable Clinical Terms Definitions
Infant, Newborn: An infant during the first 28 days after birth.
