Summary & Overview
Single Level Combined Anterior and Posterior Spinal Fusion Except Cervical: Inpatient Reimbursement Overview
DRG 402 addresses single level combined anterior and posterior spinal fusion procedures except those in the cervical spine, encompassing operative complexity and resource use. Accurate classification matters for inpatient reimbursement because it determines Diagnosis-Related Group assignment and the associated Medicare Severity Diagnosis-Related Group payment for hospitals.
DRG 402 Overview
DRG 402 covers inpatient admissions for single level combined anterior and posterior spinal fusion procedures outside the cervical region. This captures complex thoracic or lumbosacral fusion operations that involve both anterior and posterior approaches at a single spinal level. It matters for Medicare payment because the surgical approach and resource intensity influence the Diagnosis-Related Group assignment and consequent Medicare Severity Diagnosis-Related Group reimbursement. Proper classification affects hospital payment for operative care, supply use, and length of stay.
National Payment Rates
Across payers the observed rate range for DRG 402 spans from $370 (minimum observed) up to $140K, with mean payer averages ranging roughly from $22K to $70K depending on insurer. The widest spread in observed values appears for Cigna and Aetna with maximums reaching $140K while some payers report minimums near the low hundreds, indicating high variability. See the accompanying table and chart below for payer-specific percentiles and distribution details.
The CMS 2023 data represent national Medicare fee-for-service inpatient payments published under the CMS Provider Utilization and Payment Data program. The table below shows average total payment, average submitted covered charges, average Medicare payment amount, and total discharges for DRG 402. These columns provide aggregated payment and utilization metrics at the national level for Medicare FFS inpatient claims.
State Payment Rates
State: Alaska1 / 47
Alaska Benchmarks
Alaska’s DRG 402 state benchmarks are uniform across reported payers, with rates at $63K for both Anthem and Blue Cross Blue Shield, reflecting a narrow rate range across payers. This state-level rate is notably higher than many national median values and represents a marked deviation above typical national rates. Refer to the table and chart below for payer-specific percentiles and distribution.
Key Insights for Alaska
- Anthem is the highest-paying payer in Alaska at $63K, while Blue Cross Blue Shield is the lowest-paying payer at $63K (effectively all reported payers pay the same rate).
- Alaska’s uniform $63K state benchmark sits well above many national median values and aligns with the upper end of national distributions, indicating a meaningful positive deviation from typical national rates.
Clinical Trials
- Perioperative enhanced recovery and surgical technique optimization studies: randomized or prospective cohort studies comparing different approaches to combined anterior-posterior single‑level thoracolumbar fusion (for example variations in incision strategy, staging of anterior versus posterior components, use of minimally invasive anterior access versus open exposure, and intraoperative adjuncts like navigation or neuromonitoring). These trials enroll adults undergoing single‑level combined anterior and posterior fusion for degenerative instability, deformity, trauma, or revision indications and measure intraoperative metrics (blood loss, operative time), complication rates (vascular, neural, graft/implant issues), and 30‑ to 90‑day morbidity. Results inform surgeons and hospitals about techniques that reduce perioperative complications and resource use, and help payers assess short‑term costs and readmission risk associated with specific operative strategies.
- Comparative effectiveness and implant/biologic evaluation studies: pragmatic trials and registry‑based comparative studies assessing different posterior instrumentation constructs, anterior interbody structural grafts or cages, and adjunctive biologics (bone graft extenders or osteoinductive products) on fusion rates, alignment maintenance, and need for reoperation at 1–2 years. These studies typically enroll heterogeneous adult populations indicated for single‑level combined fusion (including degenerative spondylolisthesis, adjacent segment failure, or post‑traumatic instability) and stratify by bone quality, smoking status, and prior surgery to evaluate real‑world effectiveness. Findings are crucial for providers to select implants and grafting strategies that maximize fusion success and minimize revision, and for payers to evaluate long‑term cost‑effectiveness and coverage policies for higher‑cost implants or biologic adjuncts.
- Post‑discharge outcomes, rehabilitation, and value‑based care studies: prospective cohort or interventional trials testing postoperative care pathways such as intensified inpatient rehabilitation versus standard therapy, opioid‑sparing multimodal analgesia and tapering protocols, and remote monitoring for early identification of complications and functional recovery trajectories over 90 days to 1 year. These studies focus on the typical DRG population discharged after single‑level combined fusion, including older adults with comorbidities and those at higher risk of prolonged opioid use or delayed recovery, and measure functional outcomes, pain scores, quality of life, discharge disposition, and total episode‑of‑care costs. Evidence from this research guides discharge planning, rehabilitation intensity, and bundled payment models, helping providers and payers reduce readmissions, improve functional recovery, and contain post‑acute care expenditures.
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