MS-DRG · FY 2026 v43.0
MS-DRG 307 – Cardiac Congenital and Valvular Disorders without MCC
A Medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Inpatient cases group to DRG 307 when the ICD-10-CM principal diagnosis is one of the 146 codes listed below and no secondary diagnosis on the MCC list is present. Its FY 2026 relative weight is 0.9132 with a geometric mean length of stay of 2.2 days.
Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
0.9132
Relative Weight
2.2
Geometric Mean LOS (days)
2.8
Arithmetic Mean LOS (days)
146
Principal Diagnosis Codes
Severity family
DRG 306with MCCWeight 1.5758 · GMLOS 3.8 daysDRG 307without MCCWeight 0.9132 · GMLOS 2.2 days
How a case is assigned to DRG 307
The grouper first assigns the case to MDC 05 from the principal diagnosis and finds no qualifying operating-room procedure (this is a Medical DRG; ICD-10-PCS codes do not drive assignment here), then applies the severity split from secondary diagnoses: with MCC → 306; without MCC → 307.
ICD-10-CM
Principal Diagnosis Codes 146 codes · 26 categories
146 of 146 shown
B33 Other viral diseases, not elsewhere classified1 code
- B33.21 Viral endocarditis
I01 Rheumatic fever with heart involvement1 code
- I01.1 Acute rheumatic endocarditis
I05 Rheumatic mitral valve diseases5 codes
I06 Rheumatic aortic valve diseases5 codes
I07 Rheumatic tricuspid valve diseases5 codes
I08 Multiple valve diseases6 codes
- I08.0 Rheumatic disorders of both mitral and aortic valves
- I08.1 Rheumatic disorders of both mitral and tricuspid valves
- I08.2 Rheumatic disorders of both aortic and tricuspid valves
- I08.3 Combined rheumatic disorders of mitral, aortic and tricuspid valves
- I08.8 Other rheumatic multiple valve diseases
- I08.9 Rheumatic multiple valve disease, unspecified
I09 Other rheumatic heart diseases2 codes
I23 Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)2 codes
I34 Nonrheumatic mitral valve disorders6 codes
I35 Nonrheumatic aortic valve disorders5 codes
I36 Nonrheumatic tricuspid valve disorders5 codes
I37 Nonrheumatic pulmonary valve disorders5 codes
I38 Endocarditis, valve unspecified1 code
- I38 Endocarditis, valve unspecified
I39 Endocarditis and heart valve disorders in diseases classified elsewhere1 code
- I39 Endocarditis and heart valve disorders in diseases classified elsewhere
I51 Complications and ill-defined descriptions of heart disease2 codes
Q20 Congenital malformations of cardiac chambers and connections9 codes
- Q20.0 Common arterial trunk
- Q20.1 Double outlet right ventricle
- Q20.2 Double outlet left ventricle
- Q20.3 Discordant ventriculoarterial connection
- Q20.4 Double inlet ventricle
- Q20.5 Discordant atrioventricular connection
- Q20.6 Isomerism of atrial appendages
- Q20.8 Other congenital malformations of cardiac chambers and connections
- Q20.9 Congenital malformation of cardiac chambers and connections, unspecified
Q21 Congenital malformations of cardiac septa17 codes
- Q21.0 Ventricular septal defect
- Q21.10 Atrial septal defect, unspecified
- Q21.11 Secundum atrial septal defect
- Q21.12 Patent foramen ovale
- Q21.13 Coronary sinus atrial septal defect
- Q21.14 Superior sinus venosus atrial septal defect
- Q21.15 Inferior sinus venosus atrial septal defect
- Q21.16 Sinus venosus atrial septal defect, unspecified
- Q21.19 Other specified atrial septal defect
- Q21.20 Atrioventricular septal defect, unspecified as to partial or complete
- Q21.21 Partial atrioventricular septal defect
- Q21.22 Transitional atrioventricular septal defect
- Q21.23 Complete atrioventricular septal defect
- Q21.3 Tetralogy of Fallot
- Q21.4 Aortopulmonary septal defect
- Q21.8 Other congenital malformations of cardiac septa
- Q21.9 Congenital malformation of cardiac septum, unspecified
Q22 Congenital malformations of pulmonary and tricuspid valves9 codes
- Q22.0 Pulmonary valve atresia
- Q22.1 Congenital pulmonary valve stenosis
- Q22.2 Congenital pulmonary valve insufficiency
- Q22.3 Other congenital malformations of pulmonary valve
- Q22.4 Congenital tricuspid stenosis
- Q22.5 Ebstein's anomaly
- Q22.6 Hypoplastic right heart syndrome
- Q22.8 Other congenital malformations of tricuspid valve
- Q22.9 Congenital malformation of tricuspid valve, unspecified
Q23 Congenital malformations of aortic and mitral valves9 codes
- Q23.0 Congenital stenosis of aortic valve
- Q23.1 Congenital insufficiency of aortic valve
- Q23.2 Congenital mitral stenosis
- Q23.3 Congenital mitral insufficiency
- Q23.4 Hypoplastic left heart syndrome
- Q23.81 Bicuspid aortic valve
- Q23.82 Congenital mitral valve cleft leaflet
- Q23.88 Other congenital malformations of aortic and mitral valves
- Q23.9 Congenital malformation of aortic and mitral valves, unspecified
Q24 Other congenital malformations of heart8 codes
Q25 Congenital malformations of great arteries22 codes
- Q25.0 Patent ductus arteriosus
- Q25.1 Coarctation of aorta
- Q25.21 Interruption of aortic arch
- Q25.29 Other atresia of aorta
- Q25.3 Supravalvular aortic stenosis
- Q25.40 Congenital malformation of aorta unspecified
- Q25.41 Absence and aplasia of aorta
- Q25.42 Hypoplasia of aorta
- Q25.43 Congenital aneurysm of aorta
- Q25.44 Congenital dilation of aorta
- Q25.45 Double aortic arch
- Q25.46 Tortuous aortic arch
- Q25.47 Right aortic arch
- Q25.48 Anomalous origin of subclavian artery
- Q25.49 Other congenital malformations of aorta
- Q25.5 Atresia of pulmonary artery
- Q25.6 Stenosis of pulmonary artery
- Q25.71 Coarctation of pulmonary artery
- Q25.72 Congenital pulmonary arteriovenous malformation
- Q25.79 Other congenital malformations of pulmonary artery
- Q25.8 Other congenital malformations of other great arteries
- Q25.9 Congenital malformation of great arteries, unspecified
Q26 Congenital malformations of great veins7 codes
- Q26.0 Congenital stenosis of vena cava
- Q26.1 Persistent left superior vena cava
- Q26.2 Total anomalous pulmonary venous connection
- Q26.3 Partial anomalous pulmonary venous connection
- Q26.4 Anomalous pulmonary venous connection, unspecified
- Q26.8 Other congenital malformations of great veins
- Q26.9 Congenital malformation of great vein, unspecified
Q87 Other specified congenital malformation syndromes affecting multiple systems5 codes
R01 Cardiac murmurs and other cardiac sounds2 codes
T82 Complications of cardiac and vascular prosthetic devices, implants and grafts4 codes
ICD-10-PCS
Procedure Codes
Procedure codes do not drive assignment for this DRG. DRG 307 is a Medical DRG, assigned from the principal diagnosis above.
Frequently Asked Questions
What is MS-DRG 307?
MS-DRG 307 (Cardiac Congenital and Valvular Disorders without MCC) is a medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Its FY 2026 relative weight is 0.9132 with a geometric mean length of stay of 2.2 days.
What is the difference between DRG 306, 307?
All 2 share the same base category; the severity of secondary diagnoses separates them: 306 (with MCC), 307 (without MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.
How many diagnosis codes group to DRG 307?
146 ICD-10-CM principal diagnosis codes group to this DRG, spanning 26 three-character categories.
What is the relative weight of DRG 307?
The FY 2026 relative weight of this DRG is 0.9132, meaning reimbursement of roughly 0.91 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
← PreviousDRG 306 – Cardiac Congenital and Valvular Disorders with MCCNext →DRG 308 – Cardiac Arrhythmia and Conduction Disorders with MCC
Source: CMS ICD-10 MS-DRG v43.0 Definitions Manual and the FY 2026 IPPS Final Rule (Table 5), effective October 1, 2025 through September 30, 2026. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.
