Newborn affected by abnormality in fetal (intrauterine) heart rate or rhythm, unspecified as to time of onset

P03.819 (“Newborn affected by abnormality in fetal (intrauterine) heart rate or rhythm, unspecified as to time of onset”) is a diagnosis code that identifies a specific condition, injury, or finding on a medical claim in the ICD-10-CM code set. Whether it is billed — and whether a payer covers it — depends on the clinical setting, documentation, and plan rules.