MS-DRG · FY 2026 v43.0
MS-DRG 303 – Atherosclerosis without MCC
A Medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Inpatient cases group to DRG 303 when the ICD-10-CM principal diagnosis is one of the 63 codes listed below and no secondary diagnosis on the MCC list is present. Its FY 2026 relative weight is 0.6732 with a geometric mean length of stay of 1.8 days.
Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
0.6732
Relative Weight
1.8
Geometric Mean LOS (days)
2.3
Arithmetic Mean LOS (days)
63
Principal Diagnosis Codes
Severity family
DRG 302with MCCWeight 1.1966 · GMLOS 2.9 daysDRG 303without MCCWeight 0.6732 · GMLOS 1.8 days
How a case is assigned to DRG 303
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 → 302; without MCC → 303.
ICD-10-CM
Principal Diagnosis Codes 63 codes · 6 categories
63 of 63 shown
I25 Chronic ischemic heart disease53 codes
- I25.10 Atherosclerotic heart disease of native coronary artery without angina pectoris
- I25.110 Atherosclerotic heart disease of native coronary artery with unstable angina pectoris
- I25.111 Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm
- I25.112 Atherosclerotic heart disease of native coronary artery with refractory angina pectoris
- I25.118 Atherosclerotic heart disease of native coronary artery with other forms of angina pectoris
- I25.119 Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris
- I25.2 Old myocardial infarction
- I25.5 Ischemic cardiomyopathy
- I25.6 Silent myocardial ischemia
- I25.700 Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris
- I25.701 Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris with documented spasm
- I25.702 Atherosclerosis of coronary artery bypass graft(s), unspecified, with refractory angina pectoris
- I25.708 Atherosclerosis of coronary artery bypass graft(s), unspecified, with other forms of angina pectoris
- I25.709 Atherosclerosis of coronary artery bypass graft(s), unspecified, with unspecified angina pectoris
- I25.710 Atherosclerosis of autologous vein coronary artery bypass graft(s) with unstable angina pectoris
- I25.711 Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris with documented spasm
- I25.712 Atherosclerosis of autologous vein coronary artery bypass graft(s) with refractory angina pectoris
- I25.718 Atherosclerosis of autologous vein coronary artery bypass graft(s) with other forms of angina pectoris
- I25.719 Atherosclerosis of autologous vein coronary artery bypass graft(s) with unspecified angina pectoris
- I25.720 Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris
- I25.721 Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris with documented spasm
- I25.722 Atherosclerosis of autologous artery coronary artery bypass graft(s) with refractory angina pectoris
- I25.728 Atherosclerosis of autologous artery coronary artery bypass graft(s) with other forms of angina pectoris
- I25.729 Atherosclerosis of autologous artery coronary artery bypass graft(s) with unspecified angina pectoris
- I25.730 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unstable angina pectoris
- I25.731 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris with documented spasm
- I25.732 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with refractory angina pectoris
- I25.738 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with other forms of angina pectoris
- I25.739 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unspecified angina pectoris
- I25.750 Atherosclerosis of native coronary artery of transplanted heart with unstable angina
- I25.751 Atherosclerosis of native coronary artery of transplanted heart with angina pectoris with documented spasm
- I25.752 Atherosclerosis of native coronary artery of transplanted heart with refractory angina pectoris
- I25.758 Atherosclerosis of native coronary artery of transplanted heart with other forms of angina pectoris
- I25.759 Atherosclerosis of native coronary artery of transplanted heart with unspecified angina pectoris
- I25.760 Atherosclerosis of bypass graft of coronary artery of transplanted heart with unstable angina
- I25.761 Atherosclerosis of bypass graft of coronary artery of transplanted heart with angina pectoris with documented spasm
- I25.762 Atherosclerosis of bypass graft of coronary artery of transplanted heart with refractory angina pectoris
- I25.768 Atherosclerosis of bypass graft of coronary artery of transplanted heart with other forms of angina pectoris
- I25.769 Atherosclerosis of bypass graft of coronary artery of transplanted heart with unspecified angina pectoris
- I25.790 Atherosclerosis of other coronary artery bypass graft(s) with unstable angina pectoris
- I25.791 Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris with documented spasm
- I25.792 Atherosclerosis of other coronary artery bypass graft(s) with refractory angina pectoris
- I25.798 Atherosclerosis of other coronary artery bypass graft(s) with other forms of angina pectoris
- I25.799 Atherosclerosis of other coronary artery bypass graft(s) with unspecified angina pectoris
- I25.810 Atherosclerosis of coronary artery bypass graft(s) without angina pectoris
- I25.811 Atherosclerosis of native coronary artery of transplanted heart without angina pectoris
- I25.812 Atherosclerosis of bypass graft of coronary artery of transplanted heart without angina pectoris
- I25.82 Chronic total occlusion of coronary artery
- I25.83 Coronary atherosclerosis due to lipid rich plaque
- I25.84 Coronary atherosclerosis due to calcified coronary lesion
- I25.85 Chronic coronary microvascular dysfunction
- I25.89 Other forms of chronic ischemic heart disease
- I25.9 Chronic ischemic heart disease, unspecified
I51 Complications and ill-defined descriptions of heart disease4 codes
I52 Other heart disorders in diseases classified elsewhere1 code
- I52 Other heart disorders in diseases classified elsewhere
I87 Other disorders of veins2 codes
I99 Other and unspecified disorders of circulatory system2 codes
R93 Abnormal findings on diagnostic imaging of other body structures1 code
- R93.1 Abnormal findings on diagnostic imaging of heart and coronary circulation
ICD-10-PCS
Procedure Codes
Procedure codes do not drive assignment for this DRG. DRG 303 is a Medical DRG, assigned from the principal diagnosis above.
Frequently Asked Questions
What is MS-DRG 303?
MS-DRG 303 (Atherosclerosis without MCC) is a medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Its FY 2026 relative weight is 0.6732 with a geometric mean length of stay of 1.8 days.
What is the difference between DRG 302, 303?
All 2 share the same base category; the severity of secondary diagnoses separates them: 302 (with MCC), 303 (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 303?
63 ICD-10-CM principal diagnosis codes group to this DRG, spanning 6 three-character categories.
What is the relative weight of DRG 303?
The FY 2026 relative weight of this DRG is 0.6732, meaning reimbursement of roughly 0.67 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
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.
