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    v1.0.28
    OpenPayerBilling CodesDiseases and Disorders of the Musculoskeletal System and Connective TissueDRG 539-osteomyelitis-with-mcc
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    Osteomyelitis with Major Complication or Comorbidity: Inpatient Reimbursement Overview

    DRG 539 addresses osteomyelitis cases with Major Complication or Comorbidity that drive increased resource utilization and longer hospital stays. Accurate classification matters for inpatient reimbursement because it aligns Medicare Severity Diagnosis-Related Group payment with the expected intensity of services and costs.

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    DRG 539 Overview

    DRG 539 covers inpatient admissions for osteomyelitis with Major Complication or Comorbidity, typically involving severe or systemic bone infection requiring prolonged medical management, possible surgical debridement, and extended antimicrobial therapy. This Diagnosis-Related Group signals higher resource use due to intensive diagnostics, operative interventions, and longer lengths of stay. For Medicare payment purposes, classification into this group increases reimbursement relative to less complex osteomyelitis cases because of the expected higher cost of care.

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    Clinical Trials

    • Acute antimicrobial strategy trials: randomized or prospective studies comparing different routes, durations, or combinations of antimicrobial therapy in hospitalized adults with acute osteomyelitis complicated by major comorbidities (for example severe diabetes, peripheral vascular disease, or immunosuppression) and associated sepsis or surgical interventions. These trials focus on optimizing time to clinical stability, eradication of infection on culture/imaging, and reducing inpatient length of stay while monitoring complications such as antimicrobial toxicity. Results are highly relevant to hospital clinicians and payers because they can inform protocols that shorten costly inpatient days, reduce readmissions, and guide formulary and stewardship decisions for high-risk DRG 539 patients.
    • Surgical and device-related comparative effectiveness studies: prospective cohort studies or randomized trials comparing operative approaches (debridement alone, staged procedures, or use of local antimicrobial delivery systems) and adjunctive wound/soft-tissue reconstruction strategies in patients with osteomyelitis involving bone loss or prosthetic material. These studies enroll medically complex inpatients under DRG 539 who require coordination of orthopedics, plastics, and infectious disease services to determine which approaches improve rates of limb salvage, surgical site healing, and need for reoperation. Findings affect provider surgical pathways and payer assessments of cost-effectiveness for expensive procedural options and post-operative resource utilization.
    • Post-discharge outcomes and care-transition research: observational and interventional studies examining coordinated outpatient management models (early discharge with outpatient parenteral antimicrobial therapy, telehealth follow-up, home health wound care, and structured rehabilitation) in patients discharged after inpatient treatment for osteomyelitis with major complications. These studies target readmission risk, functional recovery, long-term eradication of infection, and total episode-of-care costs among medically complex patients common to DRG 539. Evidence from these studies helps health systems and payers design discharge criteria, case management, and payment bundles to reduce costly readmissions and improve long-term outcomes.

    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

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    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

    429-COMBINED-ANTERIOR-AND-POSTERIOR-CERVICAL-SPINAL-FUSION-WITH-MCC

    Combined Anterior and Posterior Cervical Spinal Fusion with 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

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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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