CPT code 77372 denotes the technical component of stereotactic radiosurgery (SRS) delivered with a linear accelerator to target and ablate small intracranial lesions. Nationally, this code matters because SRS is a high-value, high-cost radiotherapeutic intervention for brain tumors, vascular malformations, and selected metastatic lesions, and accurate coding supports appropriate payment and resource planning across hospital outpatient and freestanding radiation oncology settings. Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will find a concise clinical and billing overview of the service represented by CPT code 77372, the typical sites where the technical component is performed, and payer coverage context. The publication outlines benchmark considerations, common modifiers used in practice (listed separately), and operational implications for radiation oncology departments. It is intended to inform coding staff, billing managers, and policy analysts about the clinical scope of the code, payer coverage landscape, and areas where policy or reimbursement updates frequently affect reimbursement and compliance. Data not available in the input for specific payor fee schedules, ICD-10 pairings, or associated taxonomies is noted as such in detailed sections.