I21.9

Billable

Acute myocardial infarction, unspecified

I21.9 is the ICD-10-CM code for Acute myocardial infarction, unspecified. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
I00-I99
Parent
I21
Edition
FY2026

I00-I99 Diseases of the circulatory system

Includes

  • Myocardial infarction (acute) NOS

Frequently asked questions

What is ICD-10 code I21.9?
I21.9 is the ICD-10-CM code for "Acute myocardial infarction, unspecified". It falls under I00-I99 Diseases of the circulatory system.
Is I21.9 a billable code?
Yes — I21.9 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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