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    v1.0.30
    OpenPayerBilling CodesInfectious and Parasitic Diseases, Systemic or Unspecified SitesDRG 865-viral-illness-with-mcc
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    Viral Illness with MCC: Inpatient Reimbursement Overview

    DRG 865 pertains to inpatient stays for viral illness when a Major Complication or Comorbidity is present, reflecting higher clinical complexity. Assigning this Diagnosis-Related Group affects Medicare inpatient reimbursement by recognizing increased resource needs associated with severe presentations.

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    DRG 865 Overview

    DRG 865 covers inpatient admissions for primary viral illnesses when the patient has at least one Major Complication or Comorbidity, indicating greater clinical severity and resource use. This Diagnosis-Related Group groups cases where viral infection management is complicated by significant additional conditions that drive longer stays, higher intensity services, and increased costs. It matters for Medicare payment because the presence of a Major Complication or Comorbidity elevates the reimbursement relative to less severe viral illness groupings, aligning payment with expected resource consumption. Accurate coding of the viral diagnosis and accompanying Major Complication or Comorbidity is essential to assign this Diagnosis-Related Group correctly.

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    Clinical Trials

    • Acute antiviral and supportive intervention trials: randomized or pragmatic studies testing timing, dosing, or combinations of antiviral therapies and adjunctive supportive measures (e.g., oxygen delivery strategies, fluid management protocols, or corticosteroid timing) in hospitalized patients with severe viral illnesses presenting with major complications (MCC) such as respiratory failure, sepsis, or encephalopathy. These trials enroll patients during the index admission and focus on short-term clinical endpoints like respiratory support duration, ICU transfer, organ failure progression, and in-hospital mortality. Results inform in-hospital care pathways and resource utilization decisions important to providers and payers by identifying interventions that reduce length of stay and costly complications.
    • Comparative effectiveness and risk-stratification studies across comorbidity subgroups: observational cohort studies or pragmatic trials comparing management strategies (for example, different anticoagulation intensities, antibiotic stewardship approaches for presumed bacterial coinfection, or thresholds for advanced respiratory support) across older adults and patients with common comorbidities such as chronic lung disease, heart failure, or immunosuppression who are coded to Viral Illness with MCC. These studies use real-world data to evaluate which approaches yield the best outcomes (readmission, complications, resource use) in specific high-risk subpopulations. Findings guide tailored clinical pathways, coding accuracy, and payer case-mix adjustment by clarifying heterogeneity in outcomes and costs within this DRG.
    • Post-discharge outcomes, rehabilitation, and health economics studies: prospective or retrospective studies following survivors after hospital discharge to measure functional recovery, rates of readmission, long-term organ dysfunction, and health-care utilization, as well as cost-effectiveness analyses of inpatient interventions. These studies target patients who had major complications during their viral illness hospitalization to quantify downstream needs for rehabilitation, home health, or durable medical equipment and to model economic impact on payers. The evidence supports discharge planning, bundled-payment models, and investment in transitional care programs that could reduce readmissions and overall spending for this DRG.

    Related Codes

    853-INFECTIOUS-AND-PARASITIC-DISEASES-WITH-O-R-PROCEDURES-WITH-MCC

    Infectious and Parasitic Diseases with O.R. Procedures with MCC: Inpatient Reimbursement Overview

    854-INFECTIOUS-AND-PARASITIC-DISEASES-WITH-O-R-PROCEDURES-WITH-CC

    Infectious and Parasitic Diseases with O.R. Procedures with CC: Inpatient Reimbursement Overview

    855-INFECTIOUS-AND-PARASITIC-DISEASES-WITH-O-R-PROCEDURES-WITHOUT-CC-MCC

    Infectious and Parasitic Diseases with O.R. Procedures without CC/MCC: Inpatient Reimbursement Overview

    856-POSTOPERATIVE-OR-POST-TRAUMATIC-INFECTIONS-WITH-O-R-PROCEDURES-WITH-MCC

    Postoperative or Post-Traumatic Infections with O.R. Procedures with MCC: Inpatient Reimbursement Overview

    857-POSTOPERATIVE-OR-POST-TRAUMATIC-INFECTIONS-WITH-O-R-PROCEDURES-WITH-CC

    Postoperative or Post-Traumatic Infections with O.R. Procedures with CC: Inpatient Reimbursement Overview

    858-POSTOPERATIVE-OR-POST-TRAUMATIC-INFECTIONS-WITH-O-R-PROCEDURES-WITHOUT-CC-MCC

    Postoperative or Post-Traumatic Infections with O.R. Procedures without CC/MCC: Inpatient Reimbursement Overview

    862-POSTOPERATIVE-AND-POST-TRAUMATIC-INFECTIONS-WITH-MCC

    Postoperative and Post-Traumatic Infections with MCC: Inpatient Reimbursement Overview

    863-POSTOPERATIVE-AND-POST-TRAUMATIC-INFECTIONS-WITHOUT-MCC

    Postoperative and Post-Traumatic Infections without MCC: Inpatient Reimbursement Overview

    864-FEVER-AND-INFLAMMATORY-CONDITIONS

    Fever and Inflammatory Conditions: Inpatient Reimbursement Overview

    866-VIRAL-ILLNESS-WITHOUT-MCC

    Viral Illness without MCC: Inpatient Reimbursement Overview

    Showing 1–10 of 16

    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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