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  3. Diagnosis Codes in MS-DRG 280 - Acute Myocardial Infarction, Discharged Alive With MCC

Diagnosis Codes in MS-DRG 280 - Acute Myocardial Infarction, Discharged Alive With MCC

The Medicare Severity Diagnosis-Related Group (MS-DRG) is a patient classification system used to categorize hospital cases based on clinical similarity and expected resource use. MS-DRGs organize all possible principal diagnoses into mutually exclusive groups known as Major Diagnostic Categories (MDCs), which help determine reimbursement under the Medicare Inpatient Prospective Payment System.

This section lists the diagnosis codes included in MS-DRG V42.0: Acute Myocardial Infarction, Discharged Alive with MCC from October 1, 2024, through September 30, 2025.

MS-DRG: 280

MS-DRG Title: Acute Myocardial Infarction, Discharged Alive with MCC

MCD: 05

Relative Weight: 1.6415 Relative Weight
The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Geometric LOS: 1.64 Geometric Length of Stay
The geometric mean length of stay (GMLOS) is used by Medicare to calculate the reimbursement for patients whose medical treatment takes a much longer or shorter time than average.

Arithmetic LOS: 4.10 Arithmetic Length of Stay
The average length of stay (ALOS) reflects the average number of days a patient spends in a hospital for each admission.

  • I21 - Acute myocardial infarction

    • 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.B - Myocardial infarction with coronary microvascular dysfunction

  • I21.0 - ST elevation (STEMI) myocardial infarction of anterior wall

    • 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

  • I21.1 - ST elevation (STEMI) myocardial infarction of inferior 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

  • I21.2 - ST elevation (STEMI) myocardial infarction of other sites

    • I21.21 - ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery

    • I21.29 - ST elevation (STEMI) myocardial infarction involving other sites

  • I21.A - Other type of myocardial infarction

    • I21.A1 - Myocardial infarction type 2

    • I21.A9 - Other myocardial infarction type

  • I22 - Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

    • 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