I21
Non-billableAcute myocardial infarction
I21 is the ICD-10-CM code for Acute myocardial infarction. It is a non-billable category code — use a more specific child code such as I21.0 for billing.
- Status
- Header (non-billable)
- Chapter
- I00-I99
- Subcodes
- 8
- Edition
- FY2026
I00-I99 Diseases of the circulatory system
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
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)
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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