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    v1.0.28
    OpenPayerBilling CodesDiseases and Disorders of the Circulatory SystemDRG 296-cardiac-arrest-unexplained-with-mcc
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    Cardiac Arrest, Unexplained with Major Complication or Comorbidity: Inpatient Reimbursement Overview

    DRG 296 addresses unexplained cardiac arrest cases with a Major Complication or Comorbidity and encompasses high-acuity, resource-intensive inpatient care. Proper documentation and coding are critical because assignment to this Diagnosis-Related Group affects Medicare inpatient reimbursement by reflecting increased complexity and expected costs.

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    DRG 296 Overview

    DRG 296 covers inpatient admissions for patients with unexplained cardiac arrest accompanied by a Major Complication or Comorbidity. This Diagnosis-Related Group captures high-acuity presentations requiring intensive monitoring, advanced life support, and often multiple organ system interventions. It matters for Medicare payment because the presence of a Major Complication or Comorbidity increases resource use and associated reimbursement relative to less complex cardiac arrest cases. Accurate clinical documentation and coding determine assignment to this Diagnosis-Related Group and the resulting payment level.

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    Clinical Trials

    • Acute resuscitation and postarrest hemodynamic management trials: randomized or prospective cohort studies testing timing, protocols, and bundles of immediate postarrest interventions such as targeted temperature management strategies, optimized vasopressor/inotrope titration, and standardized postarrest cardiac catheterization pathways. These studies enroll adult inpatients presenting with unexplained out-of-hospital or in-hospital cardiac arrest who survive initial resuscitation but remain at high risk for recurrent arrest or multisystem injury. Results inform short-term survival and neurologic outcome metrics that are directly relevant to hospital-level quality measures, ICU resource utilization, and payer assessments of costly critical-care bundles for DRG 296 admissions.
    • Diagnostic strategy and etiologic-workup research for unexplained cardiac arrest: prospective diagnostic-accuracy and comparative-effectiveness studies evaluating systematic use and sequencing of advanced cardiac imaging, prolonged rhythm monitoring (implantable loop recorders), genetic testing for channelopathies, and electrophysiologic studies to determine occult causes. These trials focus on survivors of unexplained cardiac arrest without an obvious acute coronary lesion, aiming to increase diagnostic yield for underlying structural, ischemic, or inherited arrhythmic disorders. Improved diagnostic pathways can reduce recurrent events, guide appropriate use of implantable devices or targeted therapies, and affect long-term cost-effectiveness and readmission rates considered by providers and payers.
    • Postdischarge outcomes and rehabilitation studies: longitudinal cohort studies and pragmatic trials assessing neurocognitive recovery, functional status, readmission risk, and cost-effectiveness of structured postarrest rehabilitation, outpatient monitoring programs, and coordinated care transitions for survivors with varying degrees of anoxic brain injury. These studies enroll patients discharged after an unexplained cardiac arrest (DRG 296) to evaluate interventions that may reduce long-term disability, caregiver burden, and unplanned healthcare utilization. Findings are relevant to payers and health systems because they inform care-pathway investments, durable medical equipment and home-health needs, and risk-adjusted outcome measures used in bundled-payment or value-based reimbursement models.

    Related Codes

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    Endovascular Abdominal Aorta with Iliac Branch Procedures: Inpatient Reimbursement Overview

    215-OTHER-HEART-ASSIST-SYSTEM-IMPLANT

    Other Heart Assist System Implant: Inpatient Reimbursement Overview

    216-CARDIAC-VALVE-AND-OTHER-MAJOR-CARDIOTHORACIC-PROCEDURES-WITH-CARDIAC-CATHETERIZATION-WITH-MCC

    Cardiac Valve and Other Major Cardiothoracic Procedures with Cardiac Catheterization with MCC: Inpatient Reimbursement Overview

    217-CARDIAC-VALVE-AND-OTHER-MAJOR-CARDIOTHORACIC-PROCEDURES-WITH-CARDIAC-CATHETERIZATION-WITH-CC

    Cardiac Valve and Other Major Cardiothoracic Procedures with Cardiac Catheterization with CC: Inpatient Reimbursement Overview

    218-CARDIAC-VALVE-AND-OTHER-MAJOR-CARDIOTHORACIC-PROCEDURES-WITH-CARDIAC-CATHETERIZATION-WITHOUT-CC-MCC

    Cardiac Valve and Other Major Cardiothoracic Procedures with Cardiac Catheterization without CC/MCC: Inpatient Reimbursement Overview

    219-CARDIAC-VALVE-AND-OTHER-MAJOR-CARDIOTHORACIC-PROCEDURES-WITHOUT-CARDIAC-CATHETERIZATION-WITH-MCC

    Cardiac Valve and Other Major Cardiothoracic Procedures with MCC: Inpatient Reimbursement Overview

    220-CARDIAC-VALVE-AND-OTHER-MAJOR-CARDIOTHORACIC-PROCEDURES-WITHOUT-CARDIAC-CATHETERIZATION-WITH-CC

    Cardiac Valve and Other Major Cardiothoracic Procedures without Cardiac Catheterization with CC: Inpatient Reimbursement Overview

    221-CARDIAC-VALVE-AND-OTHER-MAJOR-CARDIOTHORACIC-PROCEDURES-WITHOUT-CARDIAC-CATHETERIZATION-WITHOUT-CC-MCC

    Cardiac Valve and Other Major Cardiothoracic Procedures without Cardiac Catheterization without CC/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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