Summary & Overview
CPT 77372: Stereotactic Radiosurgery Technical Component
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.
Billing Code Overview
CPT code 77372 describes the technical component of stereotactic radiosurgery (SRS) using a linear accelerator. The service involves using a three-dimensional coordinate system to precisely locate small targets or lesions within the brain and destroy them with externally generated ionizing radiation. This code represents the technical delivery of high-energy X‑rays or electrons from a linear accelerator to perform the stereotactic procedure.
Service type: Stereotactic radiosurgery technical component
Typical site of service: Hospital outpatient radiation oncology department or freestanding radiation oncology center equipped with a linear accelerator
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with a solitary intracranial metastasis from non-small cell lung cancer presents with a 1.8 cm enhancing lesion in the right frontal lobe on MRI. The multidisciplinary tumor board recommends stereotactic radiosurgery (SRS) using a linear accelerator to deliver a single high-dose, highly conformal treatment to the target while sparing surrounding brain. The clinical workflow includes: pretreatment consultation and review of prior imaging; immobilization and stereotactic localization using a three-dimensional coordinate system; high-resolution treatment planning with fused diagnostic MRI and planning CT; dosimetric review and quality assurance checks; delivery of the stereotactic radiosurgery treatment (technical component billed under 77372); and post-treatment follow-up with repeat MRI at 6–12 weeks and clinical surveillance. Typical site of service is an outpatient radiation oncology department or hospital radiation therapy suite equipped for stereotactic radiosurgery.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting the physician’s interpretation and treatment planning separate from the technical delivery when only professional services are billed. |