DRG 310
Medical DRGCardiac Arrhythmia and Conduction Disorders without CC/MCC
What is MS-DRG 310?
MS-DRG 310 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 05 (MDC 05) without a significant Complication or Comorbidity. It maps to 58 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 0.5661 with a geometric mean length of stay of 1.8 days and an arithmetic mean of 2.1 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.
FY 2026 Payment Data
Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).
Related MS-DRGs in This Severity Group
The same clinical condition is split into separate DRGs by complication severity. MCC pays more than CC, which pays more than no CC/MCC.
Linked ICD-10-CM Diagnosis Mappings
- I44.0
Atrioventricular block, first degree
BillableChapter 9 - I44.1
Atrioventricular block, second degree
BillableChapter 9 - I44.2
Atrioventricular block, complete
BillableChapter 9 - I44.30
Unspecified atrioventricular block
BillableChapter 9 - I44.39
Other atrioventricular block
BillableChapter 9 - I44.4
Left anterior fascicular block
BillableChapter 9 - I44.5
Left posterior fascicular block
BillableChapter 9 - I44.60
Unspecified fascicular block
BillableChapter 9 - I44.69
Other fascicular block
BillableChapter 9 - I44.7
Left bundle-branch block, unspecified
BillableChapter 9 - I45.0
Right fascicular block
BillableChapter 9 - I45.10
Unspecified right bundle-branch block
BillableChapter 9 - I45.19
Other right bundle-branch block
BillableChapter 9 - I45.2
Bifascicular block
BillableChapter 9 - I45.3
Trifascicular block
BillableChapter 9 - I45.4
Nonspecific intraventricular block
BillableChapter 9 - I45.5
Other specified heart block
BillableChapter 9 - I45.6
Pre-excitation syndrome
BillableChapter 9 - I45.81
Long QT syndrome
BillableChapter 9 - I45.89
Other specified conduction disorders
BillableChapter 9 - I45.9
Conduction disorder, unspecified
BillableChapter 9 - I47.0
Re-entry ventricular arrhythmia
BillableChapter 9 - I47.10
Supraventricular tachycardia, unspecified
BillableChapter 9 - I47.11
Inappropriate sinus tachycardia, so stated
BillableChapter 9 - I47.19
Other supraventricular tachycardia
BillableChapter 9 - I47.20
Ventricular tachycardia, unspecified
BillableChapter 9 - I47.21
Torsades de pointes
BillableChapter 9 - I47.29
Other ventricular tachycardia
BillableChapter 9 - I47.9
Paroxysmal tachycardia, unspecified
BillableChapter 9 - I48.0
Paroxysmal atrial fibrillation
BillableChapter 9 - I48.11
Longstanding persistent atrial fibrillation
BillableChapter 9 - I48.19
Other persistent atrial fibrillation
BillableChapter 9 - I48.20
Chronic atrial fibrillation, unspecified
BillableChapter 9 - I48.21
Permanent atrial fibrillation
BillableChapter 9 - I48.3
Typical atrial flutter
BillableChapter 9 - I48.4
Atypical atrial flutter
BillableChapter 9 - I48.91
Unspecified atrial fibrillation
BillableChapter 9 - I48.92
Unspecified atrial flutter
BillableChapter 9 - I49.01
Ventricular fibrillation
BillableChapter 9 - I49.02
Ventricular flutter
BillableChapter 9 - I49.1
Atrial premature depolarization
BillableChapter 9 - I49.2
Junctional premature depolarization
BillableChapter 9 - I49.3
Ventricular premature depolarization
BillableChapter 9 - I49.40
Unspecified premature depolarization
BillableChapter 9 - I49.49
Other premature depolarization
BillableChapter 9 - I49.5
Sick sinus syndrome
BillableChapter 9 - I49.8
Other specified cardiac arrhythmias
BillableChapter 9 - I49.9
Cardiac arrhythmia, unspecified
BillableChapter 9 - Q24.6
Congenital heart block
BillableChapter 17 - R00.0
Tachycardia, unspecified
BillableChapter 18 - R00.1
Bradycardia, unspecified
BillableChapter 18 - R00.2
Palpitations
BillableChapter 18 - T82.110A
Breakdown (mechanical) of cardiac electrode, initial encounter
BillableChapter 19 - T82.111A
Breakdown (mechanical) of cardiac pulse generator (battery), initial encounter
BillableChapter 19 - T82.120A
Displacement of cardiac electrode, initial encounter
BillableChapter 19 - T82.121A
Displacement of cardiac pulse generator (battery), initial encounter
BillableChapter 19 - T82.190A
Other mechanical complication of cardiac electrode, initial encounter
BillableChapter 19 - T82.191A
Other mechanical complication of cardiac pulse generator (battery), initial encounter
BillableChapter 19