I21.3

Billable

ST elevation (STEMI) myocardial infarction of unspecified site

I21.3 is the ICD-10-CM code for ST elevation (STEMI) myocardial infarction of unspecified site. 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

  • Acute transmural myocardial infarction of unspecified site
  • Transmural (Q wave) myocardial infarction NOS
  • Type 1 ST elevation myocardial infarction of unspecified site

Frequently asked questions

What is ICD-10 code I21.3?
I21.3 is the ICD-10-CM code for "ST elevation (STEMI) myocardial infarction of unspecified site". It falls under I00-I99 Diseases of the circulatory system.
Is I21.3 a billable code?
Yes — I21.3 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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