MS-DRG · FY 2026 v43.0

MS-DRG 311 – Angina Pectoris

A Medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Inpatient cases group to DRG 311 when the ICD-10-CM principal diagnosis is one of the 10 codes listed below. Its FY 2026 relative weight is 0.7019 with a geometric mean length of stay of 1.9 days.

Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
0.7019
Relative Weight
1.9
Geometric Mean LOS (days)
2.4
Arithmetic Mean LOS (days)
10
Principal Diagnosis Codes
How a case is assigned to DRG 311

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).

ICD-10-CM

Principal Diagnosis Codes 10 codes · 2 categories

I20 Angina pectoris6 codes
  • I20.0 Unstable angina
  • I20.1 Angina pectoris with documented spasm
  • I20.2 Refractory angina pectoris
  • I20.81 Angina pectoris with coronary microvascular dysfunction
  • I20.89 Other forms of angina pectoris
  • I20.9 Angina pectoris, unspecified
I24 Other acute ischemic heart diseases4 codes
  • I24.0 Acute coronary thrombosis not resulting in myocardial infarction
  • I24.81 Acute coronary microvascular dysfunction
  • I24.89 Other forms of acute ischemic heart disease
  • I24.9 Acute ischemic heart disease, unspecified
ICD-10-PCS

Procedure Codes

Procedure codes do not drive assignment for this DRG. DRG 311 is a Medical DRG, assigned from the principal diagnosis above.

Frequently Asked Questions

What is MS-DRG 311?

MS-DRG 311 (Angina Pectoris) is a medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Its FY 2026 relative weight is 0.7019 with a geometric mean length of stay of 1.9 days.

How many diagnosis codes group to DRG 311?

10 ICD-10-CM principal diagnosis codes group to this DRG, spanning 2 three-character categories.

What is the relative weight of DRG 311?

The FY 2026 relative weight of this DRG is 0.7019, meaning reimbursement of roughly 0.70 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.

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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.