MS-DRG 284 – Acute Myocardial Infarction, Expired with CC
A Medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Inpatient cases group to DRG 284 when the ICD-10-CM principal diagnosis is one of the 18 codes listed below and a secondary diagnosis on the complication or comorbidity (CC) list is present. Its FY 2026 relative weight is 0.6922 with a geometric mean length of stay of 1.5 days.
Severity family
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 → 283; with CC → 284; without CC/MCC → 285.
Principal Diagnosis Codes 18 codes · 2 categories
I21 Acute myocardial infarction13 codes
- I21.01 ST elevation (STEMI) myocardial infarction involving left main coronary artery
- I21.02 ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
- I21.09 ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
- I21.11 ST elevation (STEMI) myocardial infarction involving right coronary artery
- I21.19 ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
- I21.21 ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
- I21.29 ST elevation (STEMI) myocardial infarction involving other sites
- I21.3 ST elevation (STEMI) myocardial infarction of unspecified site
- I21.4 Non-ST elevation (NSTEMI) myocardial infarction
- I21.9 Acute myocardial infarction, unspecified
- I21.A1 Myocardial infarction type 2
- I21.A9 Other myocardial infarction type
- I21.B Myocardial infarction with coronary microvascular dysfunction
I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction5 codes
- I22.0 Subsequent ST elevation (STEMI) myocardial infarction of anterior wall
- I22.1 Subsequent ST elevation (STEMI) myocardial infarction of inferior wall
- I22.2 Subsequent non-ST elevation (NSTEMI) myocardial infarction
- I22.8 Subsequent ST elevation (STEMI) myocardial infarction of other sites
- I22.9 Subsequent ST elevation (STEMI) myocardial infarction of unspecified site
Procedure Codes
Severity Exclusions 18 codes
When a case groups to DRG 284, these secondary diagnoses do not count as a CC or MCC for the severity split.
View excluded secondary diagnoses18
- I21.01 STEMI involving left main coronary artery
- I21.02 STEMI involving left anterior descending coronary artery
- I21.09 STEMI involving oth coronary artery of anterior wall
- I21.11 STEMI involving right coronary artery
- I21.19 STEMI involving oth coronary artery of inferior wall
- I21.21 STEMI involving left circumflex coronary artery
- I21.29 STEMI involving oth sites
- I21.3 ST elevation (STEMI) myocardial infarction of unsp site
- I21.4 Non-ST elevation (NSTEMI) myocardial infarction
- I21.9 Acute myocardial infarction, unspecified
- I21.A1 Myocardial infarction type 2
- I21.A9 Other myocardial infarction type
- I21.B Myocardial infarction with coronary microvascular dysfnct
- I22.0 Subsequent STEMI of anterior wall
- I22.1 Subsequent STEMI of inferior wall
- I22.2 Subsequent non-ST elevation (NSTEMI) myocardial infarction
- I22.8 Subsequent STEMI of sites
- I22.9 Subsequent STEMI of unsp site
Frequently Asked Questions
What is MS-DRG 284?
MS-DRG 284 (Acute Myocardial Infarction, Expired with CC) is a medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Its FY 2026 relative weight is 0.6922 with a geometric mean length of stay of 1.5 days.
What is the difference between DRG 283, 284, 285?
All 3 share the same base category; the severity of secondary diagnoses separates them: 283 (with MCC), 284 (with CC), 285 (without CC/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 284?
18 ICD-10-CM principal diagnosis codes group to this DRG, spanning 2 three-character categories.
What is the relative weight of DRG 284?
The FY 2026 relative weight of this DRG is 0.6922, meaning reimbursement of roughly 0.69 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
