CPT code 22585 represents arthrodesis (spinal fusion) performed on an additional vertebral segment following prior fusion of one or more vertebrae in the neck or back. The procedure involves removal of disk material and permanent joining of the adjacent vertebrae to address refractory pain from herniated or bulging discs and other degenerative spinal conditions. Nationally, this code matters because spinal fusion procedures are high-cost, frequently reviewed services with significant implications for utilization management, prior authorization, and bundled payment models.

Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for CPT code 22585, payer coverage considerations, typical sites of service, and common modifiers used with this code. The publication also summarizes expected claim line attributes and the policy environment that affects approval and reimbursement for additional-level spinal fusion services. This resource is intended to help billing, coding, and policy teams understand where CPT code 22585 fits within surgical spine care and payer administration at a national level.