ICD-10-CM › I21 › I21.0 I21.09 ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wallBillable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.
Applicable to Acute transmural myocardial infarction of anterior wall Anteroapical transmural (Q wave) infarction (acute) Anterolateral transmural (Q wave) infarction (acute) Anteroseptal transmural (Q wave) infarction (acute) Transmural (Q wave) infarction (acute) (of) anterior (wall) NOS Applies from I21 Acute myocardial infarction Includes cardiac infarction coronary (artery) embolism coronary (artery) occlusion coronary (artery) rupture coronary (artery) thrombosis infarction of heart, myocardium, or ventricle myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset Excludes2 (not included here) old myocardial infarction (I25.2) postmyocardial infarction syndrome (I24.1) subsequent type 1 myocardial infarction (I22.-) Use additional code code, if applicable, to identify: exposure to environmental tobacco smoke (Z77.22) history of tobacco dependence (Z87.891) occupational exposure to environmental tobacco smoke (Z57.31) status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82) tobacco dependence (F17.-) tobacco use (Z72.0) Applies from I21.0 ST elevation (STEMI) myocardial infarction of anterior wall Applicable to Type 1 ST elevation myocardial infarction of anterior wall Risk adjustment (HCC) CMS-HCC V28: HCC 228 — Acute Myocardial Infarction CMS-HCC V22: HCC 86 — Acute Myocardial Infarction RxHCC V08: HCC 188 — Coronary Artery Disease ESRD V24: HCC 86 MS-DRG index Defines the logic of DRG(s) 280-285 in MDC 05.
Approximate ICD-9-CM (GEMs) 410.01 Acute myocardial infarction of anterolateral wall, initial episode of care (approximate)410.11 Acute myocardial infarction of other anterior wall, initial episode of care (approximate)Code annotations containing back-references to I21.09 Back-references to I21.0 Type 1 Excludes: I25.82 Back-references to I21 Use Additional: I16.1 Type 1 Excludes: I5A Type 2 Excludes: I74 Type 2 Excludes: I82 Code First: Z92.82 Diagnosis Index entries for I21.09 Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › ST elevation (STEMI) › anterior (anteroapical) (anterolateral) (anteroseptal) (Q wave) (wall) Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › ST elevation (STEMI) › involving › coronary artery of anterior wall NEC Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › transmural (see also, Infarct, myocardium, ST elevation, by site) › anterior (anteroapical) (anterolateral) (anteroseptal) (Q wave) (wall) NEC Nearby codes I21I21.0I21.01I21.02I21.09 ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall (this code)I21.1I21.11I21.19I21.2I21.21