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    v1.0.28
    OpenPayerBilling CodesDiseases and Disorders of the Respiratory SystemDRG 186-pleural-effusion-with-mcc
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    Pleural Effusion with MCC: Inpatient Reimbursement Overview

    DRG 186 addresses inpatient care for pleural effusion when a Major Complication or Comorbidity is present, indicating greater clinical complexity. Correct assignment to DRG 186 matters for inpatient reimbursement because it results in higher Medicare payment to reflect increased resource needs.

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    DRG 186 Overview

    DRG 186 covers inpatient admissions for pleural effusion with a Major Complication or Comorbidity related to underlying cardiopulmonary, infectious, or malignant processes. This Diagnosis-Related Group groups patients with higher clinical complexity and resource needs due to the presence of a Major Complication or Comorbidity. It matters for Medicare payment because classification into DRG 186 yields higher relative weighting and reimbursement than lower-severity pleural effusion DRGs, reflecting increased expected resource utilization and length of stay. Accurate clinical documentation and coding determine assignment to this Diagnosis-Related Group and therefore influence Medicare inpatient payment.

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    Clinical Trials

    • Acute procedural intervention studies: randomized or prospective observational trials testing techniques for rapid pleural fluid management (for example, comparisons of early ultrasound-guided thoracentesis versus indwelling pleural catheter placement in patients with large, symptomatic pleural effusions and significant comorbidity). These studies enroll hospitalized patients with pleural effusion and a major complication or significant physiologic compromise (the population typical of DRG 186) to assess short-term outcomes such as resolution of respiratory distress, procedure-related complications, need for ICU care, and length of stay. Results are directly relevant to inpatient providers and payers because they inform resource-intensive decisions that affect cost, complication rates, and discharge timing.
    • Comparative effectiveness and infection risk trials: pragmatic studies comparing management strategies for pleural effusions complicated by infection or malignancy-related effusions, such as chest tube drainage plus fibrinolytic therapy versus combined medical management and targeted antimicrobial regimens in patients with empyema or infected effusions. These trials focus on hospitalized adults with complex effusions and major comorbid conditions, evaluating outcomes including treatment success without surgery, readmission, antibiotic use, and incidence of sepsis or other MCCs. Findings guide clinical pathways and coverage policies by clarifying which inpatient approaches reduce complications and downstream utilization for high-risk DRG 186 patients.
    • Post-discharge outcomes and care coordination studies: cohort or randomized studies assessing transitional care interventions (for example, structured post-discharge follow-up, home-based nursing for chest tube management, or early outpatient pleural services) in patients discharged after hospitalization for pleural effusion complicated by an MCC. These studies examine readmission rates, emergency department visits, patient-reported symptom control, and total 30- to 90-day costs among patients with significant comorbidities who required intensive inpatient management. This research is important to payers and health systems because reducing readmissions and improving outpatient management can lower overall episode costs and improve quality metrics for the DRG population.

    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

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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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