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    v1.0.28
    OpenPayerBilling CodesDiseases and Disorders of the Musculoskeletal System and Connective TissueDRG 546-connective-tissue-disorders-with-cc
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    Connective Tissue Disorders with CC: Inpatient Reimbursement Overview

    DRG 546 encompasses inpatient hospitalizations for connective tissue disorders with a Complication or Comorbidity, reflecting increased clinical complexity. It matters for inpatient reimbursement because the Complication or Comorbidity status raises the Diagnosis-Related Group relative weight and influences Centers for Medicare & Medicaid Services payment for the stay.

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    DRG 546 Overview

    DRG 546 covers inpatient stays for connective tissue disorders accompanied by a Complication or Comorbidity. These cases include systemic inflammatory or autoimmune conditions that complicate acute inpatient management and increase resource use. This Diagnosis-Related Group is important for Centers for Medicare & Medicaid Services payment because the presence of Complication or Comorbidity typically elevates the relative weight and reimbursement compared with cases without such comorbidity. Accurate coding of the underlying connective tissue condition and associated Complication or Comorbidity directly affects Medicare inpatient payment.

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    Clinical Trials

    • Acute immunomodulation and crisis-management studies: trials that evaluate short-term inpatient interventions (for example, high-dose corticosteroid protocols, plasmapheresis vs. alternative rapid immunomodulatory approaches) for patients admitted with severe flares or acute organ-threatening manifestations of connective tissue disorders with complication/comorbidity (CC). These studies focus on hospitalized adults who present with life‑threatening inflammation, organ dysfunction (pulmonary, renal, cardiac), or superimposed infections, and they measure time to clinical stabilization, need for ICU-level care, and in-hospital complications. Results are directly relevant to hospital clinicians and payers because they inform acute care pathways, length of stay, resource utilization, and safety profiles for high-cost inpatient therapies.
    • Comparative effectiveness studies of inpatient treatment strategies and care bundles: pragmatic trials or observational comparative-effectiveness research that compare different inpatient management strategies (for example, steroid-sparing vs. steroid-centric regimens, early multidisciplinary versus usual care pathways, or antibiotic stewardship in immunosuppressed hosts) among patients hospitalized with connective tissue disorders complicated by comorbid conditions. These studies enroll heterogeneous real-world inpatients—often older adults with multiple comorbidities or those on chronic immunosuppression—and evaluate outcomes such as readmission, complication rates, and total inpatient costs. Findings help providers optimize evidence-based in-hospital care and help payers assess which care pathways yield better outcomes per dollar spent for this high-risk DRG group.
    • Post-discharge outcomes and care transition studies: prospective cohort studies or randomized trials testing interventions focused on discharge planning, early outpatient follow-up, medication reconciliation, or home-based monitoring for patients discharged after hospitalization for connective tissue disorders with CC. The target population includes patients at high risk for relapse or readmission due to active disease, complex medication regimens, or social determinants affecting adherence. This research is critical for reducing 30‑day readmissions and downstream costs, informing case management practices, and guiding payers’ investment in transitional care programs for this DRG.

    Related Codes

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

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    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

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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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