MS-DRG v44.0 · MDC 05: Diseases and Disorders of the Circulatory System
285 — Acute Myocardial Infarction, Expired without CC/MCC
- Relative weight
- 0.539
- Geometric mean LOS
- 1.2 days
- Arithmetic mean LOS
- 1.4 days
- Type
- Medical
About MS-DRG 285
MS-DRG 285, Acute Myocardial Infarction, Expired without CC/MCC, is a medical DRG in MDC 05 (Diseases and Disorders of the Circulatory System) under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
Its FY2027 relative weight is 0.539, so Medicare's base payment for this DRG is about 0.54 times the average inpatient case (below average), before hospital-specific adjustments. The geometric mean length of stay is 1.2 days and the arithmetic mean is 1.4 days.
It belongs to a 3-level severity family: DRG 283 (with MCC, weight 1.9619), DRG 284 (with CC, weight 0.7525) and DRG 285 (without CC/MCC, weight 0.539). The highest-severity level carries 3.6 times the weight of the lowest, which is why documenting CC and MCC conditions matters.
18 ICD-10-CM diagnosis codes are part of this DRG's grouping logic; they are listed below.
ICD-10-CM codes that group to DRG 285 (18)
Chapter 9: Diseases of the circulatory system
- I21.01ST elevation (STEMI) myocardial infarction involving left main coronary artery
- I21.02ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
- I21.09ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
- I21.11ST elevation (STEMI) myocardial infarction involving right coronary artery
- I21.19ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
- I21.21ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
- I21.29ST elevation (STEMI) myocardial infarction involving other sites
- I21.3ST elevation (STEMI) myocardial infarction of unspecified site
- I21.4Non-ST elevation (NSTEMI) myocardial infarction
- I21.9Acute myocardial infarction, unspecified
- I21.A1Myocardial infarction type 2
- I21.A9Other myocardial infarction type
- I21.BMyocardial infarction with coronary microvascular dysfunction
- I22.0Subsequent ST elevation (STEMI) myocardial infarction of anterior wall
- I22.1Subsequent ST elevation (STEMI) myocardial infarction of inferior wall
- I22.2Subsequent non-ST elevation (NSTEMI) myocardial infarction
- I22.8Subsequent ST elevation (STEMI) myocardial infarction of other sites
- I22.9Subsequent ST elevation (STEMI) myocardial infarction of unspecified site
Common questions about DRG 285
What is the relative weight of DRG 285?
- 0.539 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 285?
- The geometric mean length of stay is 1.2 days; the arithmetic mean is 1.4 days.
Is DRG 285 medical or surgical?
- DRG 285 is a medical DRG.