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    OpenPayerBilling CodesDiseases and Disorders of the Musculoskeletal System and Connective TissueDRG 429-combined-anterior-and-posterior-cervical-spinal-fusion-with-mcc
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    Combined Anterior and Posterior Cervical Spinal Fusion with MCC: Inpatient Reimbursement Overview

    DRG 429 addresses combined anterior and posterior cervical spinal fusion performed with a Major Complication or Comorbidity and defines a high-acuity surgical inpatient category. It matters for inpatient reimbursement because the fusion approach combined with the presence of a Major Complication or Comorbidity increases the Diagnosis-Related Group weight and associated Medicare payment compared with less complex cervical fusion groupings.

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    DRG 429 Overview

    DRG 429 covers combined anterior and posterior cervical spinal fusion procedures performed during the same inpatient stay when a Major Complication or Comorbidity is present. This Diagnosis-Related Group reflects high-resource surgical care for complex cervical spine instability or deformity requiring circumferential fusion. It matters for Medicare payment because the presence of a Major Complication or Comorbidity elevates relative resource use and inpatient reimbursement compared with similar fusion procedures without such severity. Accurate coding of principal and secondary diagnoses and procedure approach determines assignment to this Diagnosis-Related Group.

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    Clinical Trials

    • Randomized or prospective comparative effectiveness studies of surgical approaches (e.g., staged anterior-then-posterior versus single-stage combined approaches) that evaluate perioperative morbidity, fusion rates, neurologic improvement, and length of stay in adults undergoing combined anterior and posterior cervical fusion for multilevel degenerative disease, deformity, or trauma. These trials enroll patients with complex cervical pathology requiring both anterior decompression and posterior stabilization and aim to define which operative strategy best balances neurologic outcomes, reoperation risk, and short-term complications; results are directly relevant to surgeons and payers because they inform expected resource use, complication-driven costs, and optimal care pathways for this high-cost DRG.
    • Comparative studies of implant constructs and adjuncts to fusion (for example, cage and plate configurations, use of supplemental posterior instrumentation, biologic bone graft substitutes, or osteoinductive adjuncts) focusing on fusion success, time to fusion, incidence of hardware failure, and need for revision in patients with multilevel cervical fusion and significant comorbidity (including osteoporosis or prior cervical surgery). These trials typically enroll older adults or patients with MCCs who are at higher risk of nonunion and hardware complications; findings guide implant selection and perioperative planning, impacting both clinical outcomes and downstream reimbursement related to revisions and extended hospital stays.
    • Post-discharge outcomes and health services research including prospective cohort studies or pragmatic trials evaluating bundled care pathways, rehabilitation protocols, readmission reduction strategies, and patient-reported functional and quality-of-life outcomes after combined anterior-posterior cervical fusion. These studies follow patients from discharge through 90 days to one year, often focusing on return-to-function, pain control regimens, and rates/costs of readmission or post-acute care utilization; results are important to providers and payers for designing cost-effective discharge planning, optimizing length of stay, and reducing avoidable complications that drive total cost under this DRG.

    Related Codes

    402-SINGLE-LEVEL-COMBINED-ANTERIOR-AND-POSTERIOR-SPINAL-FUSION-EXCEPT-CERVICAL

    Single Level Combined Anterior and Posterior Spinal Fusion Except Cervical: Inpatient Reimbursement Overview

    426-MULTIPLE-LEVEL-COMBINED-ANTERIOR-AND-POSTERIOR-SPINAL-FUSION-EXCEPT-CERVICAL-WITH-MCC-OR-CUSTOM-MADE-ANATOMICALLY-DESIGNED-INTERBODY-FUSION-DEVICE

    Multiple Level Combined Anterior and Posterior Spinal Fusion Except Cervical with MCC or Custom-Made Anatomically Designed Interbody Fusion Device: Inpatient Reimbursement Overview

    427-MULTIPLE-LEVEL-COMBINED-ANTERIOR-AND-POSTERIOR-SPINAL-FUSION-EXCEPT-CERVICAL-WITH-CC

    Multiple Level Combined Anterior and Posterior Spinal Fusion Except Cervical with CC: Inpatient Reimbursement Overview

    428-MULTIPLE-LEVEL-COMBINED-ANTERIOR-AND-POSTERIOR-SPINAL-FUSION-EXCEPT-CERVICAL-WITHOUT-CC-MCC

    Multiple Level Combined Anterior and Posterior Spinal Fusion Except Cervical without CC/MCC: Inpatient Reimbursement Overview

    430-COMBINED-ANTERIOR-AND-POSTERIOR-CERVICAL-SPINAL-FUSION-WITHOUT-MCC

    Combined Anterior and Posterior Cervical Spinal Fusion without MCC: Inpatient Reimbursement Overview

    447-MULTIPLE-LEVEL-SPINAL-FUSION-EXCEPT-CERVICAL-WITH-MCC-OR-CUSTOM-MADE-ANATOMICALLY-DESIGNED-INTERBODY-FUSION-DEVICE

    Multiple Level Spinal Fusion Except Cervical with MCC: Inpatient Reimbursement Overview

    448-MULTIPLE-LEVEL-SPINAL-FUSION-EXCEPT-CERVICAL-WITHOUT-MCC

    Multiple Level Spinal Fusion Except Cervical without MCC: Inpatient Reimbursement Overview

    450-SINGLE-LEVEL-SPINAL-FUSION-EXCEPT-CERVICAL-WITH-MCC-OR-CUSTOM-MADE-ANATOMICALLY-DESIGNED-INTERBODY-FUSION-DEVICE

    Single Level Spinal Fusion Except Cervical with MCC or Custom-Made Device: Inpatient Reimbursement Overview

    451-SINGLE-LEVEL-SPINAL-FUSION-EXCEPT-CERVICAL-WITHOUT-MCC

    Single Level Spinal Fusion Except Cervical without MCC: Inpatient Reimbursement Overview

    456-SPINAL-FUSION-EXCEPT-CERVICAL-WITH-SPINAL-CURVATURE-MALIGNANCY-INFECTION-OR-EXTENSIVE-FUSIONS-WITH-MCC

    Spinal Fusion Except Cervical with MCC: Inpatient Reimbursement Overview

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    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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