MS-DRG v44.0 · MDC 05: Diseases and Disorders of the Circulatory System
309 — Cardiac Arrhythmia and Conduction Disorders with CC
- Relative weight
- 0.7316
- Geometric mean LOS
- 2.2 days
- Arithmetic mean LOS
- 2.7 days
- Type
- Medical
About MS-DRG 309
MS-DRG 309, Cardiac Arrhythmia and Conduction Disorders with CC, is a medical DRG in MDC 05 (Diseases and Disorders of the Circulatory System) under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
Its FY2027 relative weight is 0.7316, so Medicare's base payment for this DRG is about 0.73 times the average inpatient case (below average), before hospital-specific adjustments. The geometric mean length of stay is 2.2 days and the arithmetic mean is 2.7 days.
It belongs to a 3-level severity family: DRG 308 (with MCC, weight 1.1806), DRG 309 (with CC, weight 0.7316) and DRG 310 (without CC/MCC, weight 0.568). The highest-severity level carries 2.1 times the weight of the lowest, which is why documenting CC and MCC conditions matters.
61 ICD-10-CM diagnosis codes are part of this DRG's grouping logic; they are listed below.
ICD-10-CM codes that group to DRG 309 (61)
Chapter 9: Diseases of the circulatory system
- I44.0Atrioventricular block, first degree
- I44.1Atrioventricular block, second degree
- I44.2Atrioventricular block, complete
- I44.30Unspecified atrioventricular block
- I44.39Other atrioventricular block
- I44.4Left anterior fascicular block
- I44.5Left posterior fascicular block
- I44.60Unspecified fascicular block
- I44.69Other fascicular block
- I44.7Left bundle-branch block, unspecified
- I45.0Right fascicular block
- I45.10Unspecified right bundle-branch block
- I45.19Other right bundle-branch block
- I45.2Bifascicular block
- I45.3Trifascicular block
- I45.4Nonspecific intraventricular block
- I45.5Other specified heart block
- I45.6Pre-excitation syndrome
- I45.81Long QT syndrome
- I45.89Other specified conduction disorders
- I45.9Conduction disorder, unspecified
- I47.0Re-entry ventricular arrhythmia
- I47.10Supraventricular tachycardia, unspecified
- I47.11Inappropriate sinus tachycardia, so stated
- I47.19Other supraventricular tachycardia
- I47.20Ventricular tachycardia, unspecified
- I47.21Torsades de pointes
- I47.22Catecholaminergic polymorphic ventricular tachycardia [CPVT]
- I47.29Other ventricular tachycardia
- I47.9Paroxysmal tachycardia, unspecified
- I48.0Paroxysmal atrial fibrillation
- I48.11Longstanding persistent atrial fibrillation
- I48.19Other persistent atrial fibrillation
- I48.20Chronic atrial fibrillation, unspecified
- I48.21Permanent atrial fibrillation
- I48.3Typical atrial flutter
- I48.4Atypical atrial flutter
- I48.91Unspecified atrial fibrillation
- I48.92Unspecified atrial flutter
- I49.01Ventricular fibrillation
- I49.02Ventricular flutter
- I49.1Atrial premature depolarization
- I49.2Junctional premature depolarization
- I49.3Ventricular premature depolarization
- I49.40Unspecified premature depolarization
- I49.49Other premature depolarization
- I49.5Sick sinus syndrome
- I49.81Brugada syndrome
- I49.82Ventricular bigeminy
- I49.89Other specified cardiac arrhythmias not elsewhere classified
- I49.9Cardiac arrhythmia, unspecified
Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Chapter 19: Injury, poisoning and certain other consequences of external causes
- T82.110ABreakdown (mechanical) of cardiac electrode, initial encounter
- T82.111ABreakdown (mechanical) of cardiac pulse generator (battery), initial encounter
- T82.120ADisplacement of cardiac electrode, initial encounter
- T82.121ADisplacement of cardiac pulse generator (battery), initial encounter
- T82.190AOther mechanical complication of cardiac electrode, initial encounter
- T82.191AOther mechanical complication of cardiac pulse generator (battery), initial encounter
Common questions about DRG 309
What is the relative weight of DRG 309?
- 0.7316 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 309?
- The geometric mean length of stay is 2.2 days; the arithmetic mean is 2.7 days.
Is DRG 309 medical or surgical?
- DRG 309 is a medical DRG.