Is I21.0 a billable ICD-10 code?

No. I21.0 is a non-billable header code. Use a more specific subcategory for claims.

I21.0 ⚠ Non-billable

ST elevation (STEMI) myocardial infarction of anterior wall

Q: What is ICD-10 code I21.0?

ICD-10-CM code I21.0 stands for "ST elevation (STEMI) myocardial infarction of anterior wall". It is a non-billable header code in the Diseases of the Circulatory System chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Diseases of the Circulatory System

Code

I21.0

System

ICD-10-CM

Billable

No — use specific code

Effective

FY2026

Chapter

Diseases of the Circulatory System

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code I21.0?

ICD-10-CM code I21.0 represents ST elevation (STEMI) myocardial infarction of anterior wall. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.

Is I21.0 billable?

No. I21.0 is a non-billable header. Select a more specific subcategory for claims submission.

What chapter is I21.0 in?

I21.0 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.

Related codes in the I21 category

I21 Acute myocardial infarction Non-billable I21.1 ST elevation (STEMI) myocardial infarction of inferior wall Non-billable I21.2 ST elevation (STEMI) myocardial infarction of other sites Non-billable I21.3 ST elevation (STEMI) myocardial infarction of unspecified site Billable I21.4 Non-ST elevation (NSTEMI) myocardial infarction Billable I21.9 Acute myocardial infarction, unspecified Billable I21.A Other type of myocardial infarction Non-billable I21.B Myocardial infarction with coronary microvascular dysfunction Billable

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