CPT code 99184 represents therapeutic hypothermia for critically ill neonates, typically applied after perinatal hypoxic events such as hypoxic–ischemic encephalopathy (HIE). The procedure involves controlled reduction of head or body temperature and continuous temperature monitoring using an esophageal probe. This intervention is clinically significant because timely, protocol-driven cooling can influence neurologic outcomes in selected neonates and is performed in high-acuity inpatient neonatal settings.

Key national payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and service setting, payer coverage considerations, common modifiers associated with claims, and the implications for billing workflows in neonatal intensive care units. The publication also outlines typical documentation elements tied to patient selection and monitoring that support medical necessity determinations.

This summary provides clinicians, coders, and billing managers with the essential context for CPT code 99184, including where the service is performed, why it matters clinically, and what to expect from payer coverage considerations. Data not available in the input are noted where applicable in detailed sections.