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    v1.0.28
    OpenPayerBilling CodesDiseases and Disorders of the Respiratory SystemDRG 179-respiratory-infections-and-inflammations-without-cc-mcc
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    Respiratory Infections and Inflammations without CC/MCC: Inpatient Reimbursement Overview

    DRG 179 addresses hospitalizations for respiratory infections and inflammations without Complication or Comorbidity or Major Complication or Comorbidity, representing lower-severity respiratory cases such as uncomplicated pneumonia or bronchitis. Correct assignment matters for inpatient reimbursement because it defines the payment weight tied to expected resource use under Medicare payment rules.

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    DRG 179 Overview

    DRG 179 covers hospital admissions for respiratory infections and inflammations without Complication or Comorbidity or Major Complication or Comorbidity, typically including cases such as uncomplicated pneumonia, bronchitis, and other non-severe lower respiratory tract infections. This Diagnosis-Related Group groups patients with similar clinical resources and expected costs, impacting average payment rates and hospital case-mix. For Medicare payment, classification into this DRG affects reimbursement level because it denotes lower expected resource use compared with cases that include Complication or Comorbidity or Major Complication or Comorbidity. Accurate clinical documentation and coding determine assignment to this Diagnosis-Related Group and thus the applicable Medicare inpatient payment.

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    Clinical Trials

    • Acute antimicrobial strategy trials: randomized studies comparing short-course versus standard-course antibiotic regimens, or evaluating rapid diagnostic-guided antibiotic de-escalation, in adult inpatients admitted for community-acquired respiratory infections without major comorbid complications. These trials enroll patients early in hospitalization to test whether shorter or targeted therapy achieves clinical cure while reducing antibiotic exposure. Findings are relevant to providers and payers because optimized antibiotic duration can shorten length of stay, reduce drug and adverse event costs, and limit antimicrobial resistance pressures in this DRG cohort.
    • Comparative effectiveness studies of supportive care and escalation protocols in non-CC/MCC respiratory infections: pragmatic hospital-based studies comparing different oxygen-delivery strategies, early mobilization and chest physiotherapy bundles, or standardized clinical pathways versus usual care for patients with moderate respiratory infections. These studies focus on resource utilization, time to clinical stability, and readmission risk among typical inpatient populations without major complications, informing which inpatient care processes most efficiently achieve recovery. Results inform hospital protocols and reimbursement decisions by identifying care pathways that improve outcomes while containing costs for this low-complexity DRG.
    • Post-discharge outcomes and readmission prevention research: observational cohorts and interventional trials testing post-discharge follow-up models (telephone/telehealth check-ins, home nursing, or pharmacy-led medication reconciliations) and patient education to reduce 30-day readmissions and emergency visits after hospitalization for respiratory infections without CC/MCC. These studies target patients at modest risk who nonetheless account for readmission penalties and downstream costs, assessing which transitions-of-care interventions reduce recurrence and utilization. Evidence from this research guides payers and providers on investments in discharge planning and outpatient support that may lower overall payments and improve quality metrics for this DRG.

    Related Codes

    163-MAJOR-CHEST-PROCEDURES-WITH-MCC

    Major Chest Procedures with MCC: Inpatient Reimbursement Overview

    164-MAJOR-CHEST-PROCEDURES-WITH-CC

    Major Chest Procedures with CC: Inpatient Reimbursement Overview

    165-MAJOR-CHEST-PROCEDURES-WITHOUT-CC-MCC

    Major Chest Procedures without CC/MCC: Inpatient Reimbursement Overview

    166-OTHER-RESPIRATORY-SYSTEM-O-R-PROCEDURES-WITH-MCC

    Other Respiratory System O.R. Procedures with MCC: Inpatient Reimbursement Overview

    167-OTHER-RESPIRATORY-SYSTEM-O-R-PROCEDURES-WITH-CC

    Other Respiratory System O.R. Procedures with CC: Inpatient Reimbursement Overview

    168-OTHER-RESPIRATORY-SYSTEM-O-R-PROCEDURES-WITHOUT-CC-MCC

    Other Respiratory System O.R. Procedures without CC/MCC: Inpatient Reimbursement Overview

    173-ULTRASOUND-ACCELERATED-AND-OTHER-THROMBOLYSIS-WITH-PRINCIPAL-DIAGNOSIS-PULMONARY-EMBOLISM

    Ultrasound Accelerated and Other Thrombolysis with Principal Diagnosis Pulmonary Embolism: Inpatient Reimbursement Overview

    175-PULMONARY-EMBOLISM-WITH-MCC-OR-ACUTE-COR-PULMONALE

    Pulmonary Embolism with MCC or Acute Cor Pulmonale: Inpatient Reimbursement Overview

    176-PULMONARY-EMBOLISM-WITHOUT-MCC

    Pulmonary Embolism without MCC: Inpatient Reimbursement Overview

    177-RESPIRATORY-INFECTIONS-AND-INFLAMMATIONS-WITH-MCC

    Respiratory Infections and Inflammations with MCC: Inpatient Reimbursement Overview

    Showing 1–10 of 40

    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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