Building The Spine Claim
Spine surgery is coded in layers. The primary procedure (for example, an anterior cervical discectomy and fusion or a posterior lumbar fusion) is reported first, followed by add-on codes for additional levels and for separately reportable components.
- Primary fusion or decompression code for the first level
- Add-on codes for each additional interspace or segment
- Instrumentation codes, by type and number of segments
- Interbody device insertion, per interspace
- Bone graft codes, where they are separately reportable for the procedure
Common Coding Problems
- Levels counted differently in the op note and on the claim
- Instrumentation segments miscounted
- Decompression reported separately when it is included in the fusion code for that level
- Graft codes reported when the primary code already includes the graft
- Co-surgeon modifiers missing when an access surgeon is involved
Medicare Prior Authorization
Since July 2021, Medicare has required prior authorization in the hospital outpatient department for cervical fusion with disc removal and for implanted spinal neurostimulators. Facet joint interventions were added in 2023. In addition, the WISeR model added prior authorization or pre-payment review for selected services, including electrical nerve stimulator implantation, in six states starting in 2026.
Commercial And Medicare Advantage Plans
Most commercial and Medicare Advantage plans require authorization for spine fusion and often specify conservative care requirements, imaging findings and the number of levels. Authorizations tied to specific codes and levels should be compared to the operative note before the claim goes out, and changes made in surgery should be reported to the plan promptly.
Frequently Asked Questions
- What happens if surgery covers more levels than were authorized?
- Contact the plan promptly, often within a few business days, to update the authorization. Many plans will deny the additional levels without it.
Billing Support For This Specialty
Physicians Professional Billing Services, Inc. has billed wound care, surgical and procedural specialties since 1998, across every Medicare Part B MAC jurisdiction.
Primary Sources
This page is general information about billing and coverage rules and is not legal, coding or reimbursement advice for a specific claim. Coverage policies change; confirm current requirements with CMS and the applicable Medicare Administrative Contractor.