CPT code 64520 designates a paravertebral sympathetic nerve block of the lumbar or thoracic region, an interventional pain-management procedure used to treat thoracic, abdominal and lower-extremity pain and to provide perioperative analgesia for thoracic and abdominal surgeries. Nationally, this code matters for access to targeted sympathetic blockade therapies that can reduce regional pain and decrease reliance on systemic analgesics. Payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will learn the clinical context and procedural purpose of 64520, common sites of service where it is delivered, and how payers typically approach coverage and claims processing for interventional sympathetic blocks. The publication provides benchmarks and coding considerations relevant to billing and compliance, highlights recent policy developments that affect coverage of interventional pain procedures, and summarizes practical documentation elements that support medical necessity determinations. The content is intended for billing professionals, clinicians ordering or performing sympathetic blocks, and policy analysts seeking a concise, national-level overview of CPT code 64520.