I21.1

Non-billable

ST elevation (STEMI) myocardial infarction of inferior wall

I21.1 is the ICD-10-CM code for ST elevation (STEMI) myocardial infarction of inferior wall. It is a non-billable category code — use a more specific child code such as I21.11 for billing.

Status
Header (non-billable)
Chapter
I00-I99
Parent
I21
Subcodes
2
Edition
FY2026

I00-I99 Diseases of the circulatory system

Includes

  • Type 1 ST elevation myocardial infarction of inferior wall

Frequently asked questions

What is ICD-10 code I21.1?
I21.1 is the ICD-10-CM code for "ST elevation (STEMI) myocardial infarction of inferior wall". It falls under I00-I99 Diseases of the circulatory system.
Is I21.1 a billable code?
No — I21.1 is a non-billable header code. Use a more specific child code (such as I21.11) for billing.
What are the subcodes of I21.1?
I21.1 has 2 more specific child codes, including I21.11, I21.19.

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

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