Medicare is changing the financial equation for spine surgeons, and reimbursement cuts are only part of it.
With thousands of specialists entering mandatory payment models, prior authorization expanding in traditional Medicare and new performance requirements ahead, surgeons face growing financial exposure tied to how care is delivered, documented and measured.
Here are seven numbers showing what’s at stake.
1. 3,319 — Specialists entering mandatory risk: CMS’ final Ambulatory Specialty Model participant list includes 3,319 clinicians in the low back pain cohort across 46 states. Beginning Jan. 1, 2027, selected orthopedic surgeons, neurosurgeons and other specialists will be evaluated on quality, cost and other performance measures, with future Medicare payments tied to their scores. The model is mandatory for selected participants.
2. 9% — The payment risk: Under ASM, participating physicians face payment adjustments ranging from negative 9% to positive 9% in the first two payment years, beginning in 2029. The adjustments apply to all covered Medicare Part B professional services, not just low back pain care. Mike Verdon, DO, a neurosurgeon in Dayton, Ohio, warned that some practices could face substantial financial swings while many surgeons remain unaware of the model.
3. 1.68% — Another proposed reimbursement cut: CMS’ proposed 2027 Medicare Physician Fee Schedule would reduce the conversion factor 1.68% for clinicians outside qualifying alternative payment models. Orthopedic surgery faces a projected additional 7% reduction on average from proposed relative value unit and other payment changes. Alexander Vaccaro, MD, PhD, president of Philadelphia-based Rothman Orthopaedics, warned that proposed efficiency adjustments could further strain spine practices by reducing payment based on shorter procedure times.
4. 33% — The reimbursement decline already absorbed: Inflation-adjusted Medicare physician payment fell 33% relative to practice costs from 2001 to 2025, according to the American Medical Association. Spine practices have responded by increasing volume, improving efficiency and shifting cases outpatient, but rising staffing, technology and malpractice expenses continue to squeeze margins.
5. 30 days — The new surgical accountability window: Medicare’s Transforming Episode Accountability Model began Jan. 1, placing spinal fusion among five procedures subject to mandatory bundled-payment accountability at selected hospitals. Under the model, hospitals are financially accountable for spending and quality through 30 days after discharge, making readmissions, rehabilitation and post-acute care increasingly consequential to financial performance.
6. 6 states — Prior authorization reaches traditional Medicare: CMS’ Wasteful and Inappropriate Service Reduction Model launched in Arizona, New Jersey, Ohio, Oklahoma, Texas and Washington in 2026. The program introduces technology-assisted prior authorization or prepayment medical review for selected services, including cervical fusion, epidural steroid injections and vertebral augmentation. The model extends utilization oversight into traditional Medicare, although CMS says existing coverage criteria remain unchanged.
7. 2029 — Another reporting overhaul could begin: CMS has proposed eliminating traditional Merit-based Incentive Payment System reporting in favor of mandatory MIPS Value Pathways beginning with the 2029 performance year, affecting 2031 payments. The shift would change how spine surgeons report performance, even though no existing pathway is dedicated exclusively to the specialty. The proposal has not been finalized.
Together, the changes point to a Medicare system in which spine surgeons face growing financial consequences not just for the procedures they perform, but for the costs, outcomes and documentation surrounding patient care.
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