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  3. Diagnosis Codes in MS-DRG 310 - Cardiac Arrhythmia And Conduction Disorders Without CC/MCC

Diagnosis Codes in MS-DRG 310 - Cardiac Arrhythmia And Conduction Disorders Without CC/MCC

The Medicare Severity Diagnosis-Related Group (MS-DRG) is a patient classification system used to categorize hospital cases based on clinical similarity and expected resource use. MS-DRGs organize all possible principal diagnoses into mutually exclusive groups known as Major Diagnostic Categories (MDCs), which help determine reimbursement under the Medicare Inpatient Prospective Payment System.

This section lists the diagnosis codes included in MS-DRG V42.0: Cardiac Arrhythmia and Conduction Disorders without CC/MCC from October 1, 2024, through September 30, 2025.

MS-DRG: 310

MS-DRG Title: Cardiac Arrhythmia and Conduction Disorders without CC/MCC

MCD: 05

Relative Weight: 0.5595 Relative Weight
The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Geometric LOS: 0.56 Geometric Length of Stay
The geometric mean length of stay (GMLOS) is used by Medicare to calculate the reimbursement for patients whose medical treatment takes a much longer or shorter time than average.

Arithmetic LOS: 1.80 Arithmetic Length of Stay
The average length of stay (ALOS) reflects the average number of days a patient spends in a hospital for each admission.

  • I44 - Atrioventricular and left bundle-branch block

    • I44.0 - Atrioventricular block, first degree

    • I44.1 - Atrioventricular block, second degree

    • I44.2 - Atrioventricular block, complete

    • I44.4 - Left anterior fascicular block

    • I44.5 - Left posterior fascicular block

    • I44.7 - Left bundle-branch block, unspecified

  • I44.3 - Other and unspecified atrioventricular block

    • I44.30 - Unspecified atrioventricular block

    • I44.39 - Other atrioventricular block

  • I44.6 - Other and unspecified fascicular block

    • I44.60 - Unspecified fascicular block

    • I44.69 - Other fascicular block

  • I45 - Other conduction disorders

    • I45.0 - Right fascicular block

    • I45.2 - Bifascicular block

    • I45.3 - Trifascicular block

    • I45.4 - Nonspecific intraventricular block

    • I45.5 - Other specified heart block

    • I45.6 - Pre-excitation syndrome

    • I45.9 - Conduction disorder, unspecified

  • I45.1 - Other and unspecified right bundle-branch block

    • I45.10 - Unspecified right bundle-branch block

    • I45.19 - Other right bundle-branch block

  • I45.8 - Other specified conduction disorders

    • I45.81 - Long QT syndrome

    • I45.89 - Other specified conduction disorders

  • I47 - Paroxysmal tachycardia

    • I47.0 - Re-entry ventricular arrhythmia

    • I47.9 - Paroxysmal tachycardia, unspecified

  • I47.1 - Supraventricular tachycardia

    • I47.10 - Supraventricular tachycardia, unspecified

    • I47.11 - Inappropriate sinus tachycardia, so stated

    • I47.19 - Other supraventricular tachycardia

  • I47.2 - Ventricular tachycardia

    • I47.20 - Ventricular tachycardia, unspecified

    • I47.21 - Torsades de pointes

    • I47.29 - Other ventricular tachycardia

  • I48 - Atrial fibrillation and flutter

    • I48.0 - Paroxysmal atrial fibrillation

    • I48.3 - Typical atrial flutter

    • I48.4 - Atypical atrial flutter

  • I48.1 - Persistent atrial fibrillation

    • I48.11 - Longstanding persistent atrial fibrillation

    • I48.19 - Other persistent atrial fibrillation

  • I48.2 - Chronic atrial fibrillation

    • I48.20 - Chronic atrial fibrillation, unspecified

    • I48.21 - Permanent atrial fibrillation

  • I48.9 - Unspecified atrial fibrillation and atrial flutter

    • I48.91 - Unspecified atrial fibrillation

    • I48.92 - Unspecified atrial flutter

  • I49 - Other cardiac arrhythmias

    • I49.1 - Atrial premature depolarization

    • I49.2 - Junctional premature depolarization

    • I49.3 - Ventricular premature depolarization

    • I49.5 - Sick sinus syndrome

    • I49.8 - Other specified cardiac arrhythmias

    • I49.9 - Cardiac arrhythmia, unspecified

  • I49.0 - Ventricular fibrillation and flutter

    • I49.01 - Ventricular fibrillation

    • I49.02 - Ventricular flutter

  • I49.4 - Other and unspecified premature depolarization

    • I49.40 - Unspecified premature depolarization

    • I49.49 - Other premature depolarization

  • Q24 - Other congenital malformations of heart

    • Q24.6 - Congenital heart block

  • R00 - Abnormalities of heart beat

    • R00.0 - Tachycardia, unspecified

    • R00.1 - Bradycardia, unspecified

    • R00.2 - Palpitations

  • T82.110 - Breakdown (mechanical) of cardiac electrode

    • T82.110A - Breakdown (mechanical) of cardiac electrode, initial encounter

  • T82.111 - Breakdown (mechanical) of cardiac pulse generator (battery)

    • T82.111A - Breakdown (mechanical) of cardiac pulse generator (battery), initial encounter

  • T82.120 - Displacement of cardiac electrode

    • T82.120A - Displacement of cardiac electrode, initial encounter

  • T82.121 - Displacement of cardiac pulse generator (battery)

    • T82.121A - Displacement of cardiac pulse generator (battery), initial encounter

  • T82.190 - Other mechanical complication of cardiac electrode

    • T82.190A - Other mechanical complication of cardiac electrode, initial encounter

  • T82.191 - Other mechanical complication of cardiac pulse generator (battery)

    • T82.191A - Other mechanical complication of cardiac pulse generator (battery), initial encounter