DRG 306

Medical DRG

Cardiac Congenital and Valvular Disorders with MCC

TypeMedicalMDC05Dx Codes146

What is MS-DRG 306?

MS-DRG 306 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 05 (MDC 05) with a Major Complication or Comorbidity (MCC). It maps to 146 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 1.5758 with a geometric mean length of stay of 3.8 days and an arithmetic mean of 5.2 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

Classification
Medical DRG
Diagnosis-driven grouping
Linked Codes
146 diagnosis
Billable Dx
100%
146 of 146 shown

FY 2026 Payment Data

Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).

Relative Weight
1.5758
Payment multiplier vs. average case (1.0)
Geometric Mean LOS
3.8 days
Used for transfer payment calculations
Arithmetic Mean LOS
5.2 days
Average length of stay
Post-Acute Transfer
No
Not subject to the transfer policy

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.

DRGTitleRel. WeightGMLOS
306Cardiac Congenital and Valvular Disorders with MCCThis page1.57583.8 days
307Cardiac Congenital and Valvular Disorders without MCC0.91322.2 days

Linked ICD-10-CM Diagnosis Mappings

  • A52.01

    Syphilitic aneurysm of aorta

    BillableChapter 1
  • A52.02

    Syphilitic aortitis

    BillableChapter 1
  • B33.21

    Viral endocarditis

    BillableChapter 1
  • I01.1

    Acute rheumatic endocarditis

    BillableChapter 9
  • I05.0

    Rheumatic mitral stenosis

    BillableChapter 9
  • I05.1

    Rheumatic mitral insufficiency

    BillableChapter 9
  • I05.2

    Rheumatic mitral stenosis with insufficiency

    BillableChapter 9
  • I05.8

    Other rheumatic mitral valve diseases

    BillableChapter 9
  • I05.9

    Rheumatic mitral valve disease, unspecified

    BillableChapter 9
  • I06.0

    Rheumatic aortic stenosis

    BillableChapter 9
  • I06.1

    Rheumatic aortic insufficiency

    BillableChapter 9
  • I06.2

    Rheumatic aortic stenosis with insufficiency

    BillableChapter 9
  • I06.8

    Other rheumatic aortic valve diseases

    BillableChapter 9
  • I06.9

    Rheumatic aortic valve disease, unspecified

    BillableChapter 9
  • I07.0

    Rheumatic tricuspid stenosis

    BillableChapter 9
  • I07.1

    Rheumatic tricuspid insufficiency

    BillableChapter 9
  • I07.2

    Rheumatic tricuspid stenosis and insufficiency

    BillableChapter 9
  • I07.8

    Other rheumatic tricuspid valve diseases

    BillableChapter 9
  • I07.9

    Rheumatic tricuspid valve disease, unspecified

    BillableChapter 9
  • I08.0

    Rheumatic disorders of both mitral and aortic valves

    BillableChapter 9
  • I08.1

    Rheumatic disorders of both mitral and tricuspid valves

    BillableChapter 9
  • I08.2

    Rheumatic disorders of both aortic and tricuspid valves

    BillableChapter 9
  • I08.3

    Combined rheumatic disorders of mitral, aortic and tricuspid valves

    BillableChapter 9
  • I08.8

    Other rheumatic multiple valve diseases

    BillableChapter 9
  • I08.9

    Rheumatic multiple valve disease, unspecified

    BillableChapter 9
  • I09.1

    Rheumatic diseases of endocardium, valve unspecified

    BillableChapter 9
  • I09.89

    Other specified rheumatic heart diseases

    BillableChapter 9
  • I23.4

    Rupture of chordae tendineae as current complication following acute myocardial infarction

    BillableChapter 9
  • I23.5

    Rupture of papillary muscle as current complication following acute myocardial infarction

    BillableChapter 9
  • I34.0

    Nonrheumatic mitral (valve) insufficiency

    BillableChapter 9
  • I34.1

    Nonrheumatic mitral (valve) prolapse

    BillableChapter 9
  • I34.2

    Nonrheumatic mitral (valve) stenosis

    BillableChapter 9
  • I34.81

    Nonrheumatic mitral (valve) annulus calcification

    BillableChapter 9
  • I34.89

    Other nonrheumatic mitral valve disorders

    BillableChapter 9
  • I34.9

    Nonrheumatic mitral valve disorder, unspecified

    BillableChapter 9
  • I35.0

    Nonrheumatic aortic (valve) stenosis

    BillableChapter 9
  • I35.1

    Nonrheumatic aortic (valve) insufficiency

    BillableChapter 9
  • I35.2

    Nonrheumatic aortic (valve) stenosis with insufficiency

    BillableChapter 9
  • I35.8

    Other nonrheumatic aortic valve disorders

    BillableChapter 9
  • I35.9

    Nonrheumatic aortic valve disorder, unspecified

    BillableChapter 9
  • I36.0

    Nonrheumatic tricuspid (valve) stenosis

    BillableChapter 9
  • I36.1

    Nonrheumatic tricuspid (valve) insufficiency

    BillableChapter 9
  • I36.2

    Nonrheumatic tricuspid (valve) stenosis with insufficiency

    BillableChapter 9
  • I36.8

    Other nonrheumatic tricuspid valve disorders

    BillableChapter 9
  • I36.9

    Nonrheumatic tricuspid valve disorder, unspecified

    BillableChapter 9
  • I37.0

    Nonrheumatic pulmonary valve stenosis

    BillableChapter 9
  • I37.1

    Nonrheumatic pulmonary valve insufficiency

    BillableChapter 9
  • I37.2

    Nonrheumatic pulmonary valve stenosis with insufficiency

    BillableChapter 9
  • I37.8

    Other nonrheumatic pulmonary valve disorders

    BillableChapter 9
  • I37.9

    Nonrheumatic pulmonary valve disorder, unspecified

    BillableChapter 9
  • I38

    Endocarditis, valve unspecified

    BillableChapter 9
  • I39

    Endocarditis and heart valve disorders in diseases classified elsewhere

    BillableChapter 9
  • I51.1

    Rupture of chordae tendineae, not elsewhere classified

    BillableChapter 9
  • I51.2

    Rupture of papillary muscle, not elsewhere classified

    BillableChapter 9
  • Q20.0

    Common arterial trunk

    BillableChapter 17
  • Q20.1

    Double outlet right ventricle

    BillableChapter 17
  • Q20.2

    Double outlet left ventricle

    BillableChapter 17
  • Q20.3

    Discordant ventriculoarterial connection

    BillableChapter 17
  • Q20.4

    Double inlet ventricle

    BillableChapter 17
  • Q20.5

    Discordant atrioventricular connection

    BillableChapter 17
  • Q20.6

    Isomerism of atrial appendages

    BillableChapter 17
  • Q20.8

    Other congenital malformations of cardiac chambers and connections

    BillableChapter 17
  • Q20.9

    Congenital malformation of cardiac chambers and connections, unspecified

    BillableChapter 17
  • Q21.0

    Ventricular septal defect

    BillableChapter 17
  • Q21.10

    Atrial septal defect, unspecified

    BillableChapter 17
  • Q21.11

    Secundum atrial septal defect

    BillableChapter 17
  • Q21.12

    Patent foramen ovale

    BillableChapter 17
  • Q21.13

    Coronary sinus atrial septal defect

    BillableChapter 17
  • Q21.14

    Superior sinus venosus atrial septal defect

    BillableChapter 17
  • Q21.15

    Inferior sinus venosus atrial septal defect

    BillableChapter 17
  • Q21.16

    Sinus venosus atrial septal defect, unspecified

    BillableChapter 17
  • Q21.19

    Other specified atrial septal defect

    BillableChapter 17
  • Q21.20

    Atrioventricular septal defect, unspecified as to partial or complete

    BillableChapter 17
  • Q21.21

    Partial atrioventricular septal defect

    BillableChapter 17
  • Q21.22

    Transitional atrioventricular septal defect

    BillableChapter 17
  • Q21.23

    Complete atrioventricular septal defect

    BillableChapter 17
  • Q21.3

    Tetralogy of Fallot

    BillableChapter 17
  • Q21.4

    Aortopulmonary septal defect

    BillableChapter 17
  • Q21.8

    Other congenital malformations of cardiac septa

    BillableChapter 17
  • Q21.9

    Congenital malformation of cardiac septum, unspecified

    BillableChapter 17
  • Q22.0

    Pulmonary valve atresia

    BillableChapter 17
  • Q22.1

    Congenital pulmonary valve stenosis

    BillableChapter 17
  • Q22.2

    Congenital pulmonary valve insufficiency

    BillableChapter 17
  • Q22.3

    Other congenital malformations of pulmonary valve

    BillableChapter 17
  • Q22.4

    Congenital tricuspid stenosis

    BillableChapter 17
  • Q22.5

    Ebstein's anomaly

    BillableChapter 17
  • Q22.6

    Hypoplastic right heart syndrome

    BillableChapter 17
  • Q22.8

    Other congenital malformations of tricuspid valve

    BillableChapter 17
  • Q22.9

    Congenital malformation of tricuspid valve, unspecified

    BillableChapter 17
  • Q23.0

    Congenital stenosis of aortic valve

    BillableChapter 17
  • Q23.1

    Congenital insufficiency of aortic valve

    BillableChapter 17
  • Q23.2

    Congenital mitral stenosis

    BillableChapter 17
  • Q23.3

    Congenital mitral insufficiency

    BillableChapter 17
  • Q23.4

    Hypoplastic left heart syndrome

    BillableChapter 17
  • Q23.81

    Bicuspid aortic valve

    BillableChapter 17
  • Q23.82

    Congenital mitral valve cleft leaflet

    BillableChapter 17
  • Q23.88

    Other congenital malformations of aortic and mitral valves

    BillableChapter 17
  • Q23.9

    Congenital malformation of aortic and mitral valves, unspecified

    BillableChapter 17
  • Q24.0

    Dextrocardia

    BillableChapter 17
  • Q24.1

    Levocardia

    BillableChapter 17
  • Q24.2

    Cor triatriatum

    BillableChapter 17
  • Q24.3

    Pulmonary infundibular stenosis

    BillableChapter 17
  • Q24.4

    Congenital subaortic stenosis

    BillableChapter 17
  • Q24.5

    Malformation of coronary vessels

    BillableChapter 17
  • Q24.8

    Other specified congenital malformations of heart

    BillableChapter 17
  • Q24.9

    Congenital malformation of heart, unspecified

    BillableChapter 17
  • Q25.0

    Patent ductus arteriosus

    BillableChapter 17
  • Q25.1

    Coarctation of aorta

    BillableChapter 17
  • Q25.21

    Interruption of aortic arch

    BillableChapter 17
  • Q25.29

    Other atresia of aorta

    BillableChapter 17
  • Q25.3

    Supravalvular aortic stenosis

    BillableChapter 17
  • Q25.40

    Congenital malformation of aorta unspecified

    BillableChapter 17
  • Q25.41

    Absence and aplasia of aorta

    BillableChapter 17
  • Q25.42

    Hypoplasia of aorta

    BillableChapter 17
  • Q25.43

    Congenital aneurysm of aorta

    BillableChapter 17
  • Q25.44

    Congenital dilation of aorta

    BillableChapter 17
  • Q25.45

    Double aortic arch

    BillableChapter 17
  • Q25.46

    Tortuous aortic arch

    BillableChapter 17
  • Q25.47

    Right aortic arch

    BillableChapter 17
  • Q25.48

    Anomalous origin of subclavian artery

    BillableChapter 17
  • Q25.49

    Other congenital malformations of aorta

    BillableChapter 17
  • Q25.5

    Atresia of pulmonary artery

    BillableChapter 17
  • Q25.6

    Stenosis of pulmonary artery

    BillableChapter 17
  • Q25.71

    Coarctation of pulmonary artery

    BillableChapter 17
  • Q25.72

    Congenital pulmonary arteriovenous malformation

    BillableChapter 17
  • Q25.79

    Other congenital malformations of pulmonary artery

    BillableChapter 17
  • Q25.8

    Other congenital malformations of other great arteries

    BillableChapter 17
  • Q25.9

    Congenital malformation of great arteries, unspecified

    BillableChapter 17
  • Q26.0

    Congenital stenosis of vena cava

    BillableChapter 17
  • Q26.1

    Persistent left superior vena cava

    BillableChapter 17
  • Q26.2

    Total anomalous pulmonary venous connection

    BillableChapter 17
  • Q26.3

    Partial anomalous pulmonary venous connection

    BillableChapter 17
  • Q26.4

    Anomalous pulmonary venous connection, unspecified

    BillableChapter 17
  • Q26.8

    Other congenital malformations of great veins

    BillableChapter 17
  • Q26.9

    Congenital malformation of great vein, unspecified

    BillableChapter 17
  • Q87.40

    Marfan syndrome, unspecified

    BillableChapter 17
  • Q87.410

    Marfan syndrome with aortic dilation

    BillableChapter 17
  • Q87.418

    Marfan syndrome with other cardiovascular manifestations

    BillableChapter 17
  • Q87.42

    Marfan syndrome with ocular manifestations

    BillableChapter 17
  • Q87.43

    Marfan syndrome with skeletal manifestation

    BillableChapter 17
  • R01.0

    Benign and innocent cardiac murmurs

    BillableChapter 18
  • R01.1

    Cardiac murmur, unspecified

    BillableChapter 18
  • T82.01XA

    Breakdown (mechanical) of heart valve prosthesis, initial encounter

    BillableChapter 19
  • T82.02XA

    Displacement of heart valve prosthesis, initial encounter

    BillableChapter 19
  • T82.03XA

    Leakage of heart valve prosthesis, initial encounter

    BillableChapter 19
  • T82.09XA

    Other mechanical complication of heart valve prosthesis, initial encounter

    BillableChapter 19