DRG 283

Medical DRG

Acute Myocardial Infarction, Expired with MCC

TypeMedicalMDC05Dx Codes18

What is MS-DRG 283?

MS-DRG 283 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 18 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 1.9808 with a geometric mean length of stay of 3.2 days and an arithmetic mean of 5.3 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

Classification

Medical DRG

Diagnosis-driven grouping

MDC

Major Diagnostic Category 05

Linked Codes

18 diagnosis

Billable Dx

100%

18 of 18 shown

FY 2026 Payment Data

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

Relative Weight

1.9808

Payment multiplier vs. average case (1.0)

Geometric Mean LOS

3.2 days

Used for transfer payment calculations

Arithmetic Mean LOS

5.3 days

Average length of stay

Post-Acute Transfer

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.

DRG	Title	Rel. Weight	GMLOS
283	Acute Myocardial Infarction, Expired with MCCThis page	1.9808	3.2 days
284	Acute Myocardial Infarction, Expired with CC	0.6922	1.5 days
285	Acute Myocardial Infarction, Expired without CC/MCC	0.5989	1.1 days

Linked ICD-10-CM Diagnosis Mappings

I21.01
ST elevation (STEMI) myocardial infarction involving left main coronary artery
BillableChapter 9
I21.02
ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
BillableChapter 9
I21.09
ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
BillableChapter 9
I21.11
ST elevation (STEMI) myocardial infarction involving right coronary artery
BillableChapter 9
I21.19
ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
BillableChapter 9
I21.21
ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
BillableChapter 9
I21.29
ST elevation (STEMI) myocardial infarction involving other sites
BillableChapter 9
I21.3
ST elevation (STEMI) myocardial infarction of unspecified site
BillableChapter 9
I21.4
Non-ST elevation (NSTEMI) myocardial infarction
BillableChapter 9
I21.9
Acute myocardial infarction, unspecified
BillableChapter 9
I21.A1
Myocardial infarction type 2
BillableChapter 9
I21.A9
Other myocardial infarction type
BillableChapter 9
I21.B
Myocardial infarction with coronary microvascular dysfunction
BillableChapter 9
I22.0
Subsequent ST elevation (STEMI) myocardial infarction of anterior wall
BillableChapter 9
I22.1
Subsequent ST elevation (STEMI) myocardial infarction of inferior wall
BillableChapter 9
I22.2
Subsequent non-ST elevation (NSTEMI) myocardial infarction
BillableChapter 9
I22.8
Subsequent ST elevation (STEMI) myocardial infarction of other sites
BillableChapter 9
I22.9
Subsequent ST elevation (STEMI) myocardial infarction of unspecified site
BillableChapter 9