285 MS-DRG: ACUTE MYOCARDIAL INFARCTION, EXPIRED WITHOUT CC/MCC
MS-DRG 285 groups Medicare inpatient hospital stays for: ACUTE MYOCARDIAL INFARCTION, EXPIRED WITHOUT CC/MCC. This is a medical MS-DRG. It falls under MDC 05 (Diseases and Disorders of the Circulatory System).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 05 — Diseases and Disorders of the Circulatory System |
| DRG Type | Medical |
| Severity Level | None |
| Relative Weight | 0.52 |
| Relative Weight (10% Cap Applied) | 0.539 |
| Geometric Mean Length of Stay | 1.2 days |
| Arithmetic Mean Length of Stay | 1.4 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
18 diagnosis codes can drive assignment here: I21.01, I21.02, I21.09, I21.11, I21.19, I21.21, I21.29, I21.3, I21.4, I21.9, I21.A1, I21.A9 and 6 more.
From the CMS MS-DRG Definitions Manual (Appendices B and E). Assignment also depends on severity, discharge status and the rest of the claim.
Contextual Map
Every relationship of 285 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Major Diagnostic Category
- MDC 05 — Diseases and Disorders of the Circulatory System[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses (18)
- I21.01 — ST elevation (STEMI) myocardial infarction involving left main coronary artery[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I21.02 — ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I21.09 — ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I21.11 — ST elevation (STEMI) myocardial infarction involving right coronary artery[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I21.19 — ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I21.21 — ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I21.29 — ST elevation (STEMI) myocardial infarction involving other sites[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I21.3 — ST elevation (STEMI) myocardial infarction of unspecified site[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 10 more
DRG family
- DRG 280 — ACUTE MYOCARDIAL INFARCTION, DISCHARGED ALIVE WITH MCC[DRG family]: “ACUTE MYOCARDIAL INFARCTION, DISCHARGED ALIVE WITH MCC — same CMS DRG family (280-285), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 280-285) · FY2027
- DRG 281 — ACUTE MYOCARDIAL INFARCTION, DISCHARGED ALIVE WITH CC[DRG family]: “ACUTE MYOCARDIAL INFARCTION, DISCHARGED ALIVE WITH CC — same CMS DRG family (280-285), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 280-285) · FY2027
- DRG 282 — ACUTE MYOCARDIAL INFARCTION, DISCHARGED ALIVE WITHOUT CC/MCC[DRG family]: “ACUTE MYOCARDIAL INFARCTION, DISCHARGED ALIVE WITHOUT CC/MCC — same CMS DRG family (280-285), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 280-285) · FY2027
- DRG 283 — ACUTE MYOCARDIAL INFARCTION, EXPIRED WITH MCC[DRG family]: “ACUTE MYOCARDIAL INFARCTION, EXPIRED WITH MCC — same CMS DRG family (280-285), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 280-285) · FY2027
- DRG 284 — ACUTE MYOCARDIAL INFARCTION, EXPIRED WITH CC[DRG family]: “ACUTE MYOCARDIAL INFARCTION, EXPIRED WITH CC — same CMS DRG family (280-285), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 280-285) · FY2027
Read from: CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44. All data sources · How to read the labels · How MedCoder verifies its implementation
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources