I21.1 ICD-10-CM Code: ST elevation (STEMI) myocardial infarction of inferior wall
I21.1 isn’t billable on its own. Choose one of the 2 billable codes beneath it, the one the documentation supports.
Official description
I21.1ST elevation (STEMI) myocardial infarction of inferior wall
ICD-10-CM diagnosis code · United States clinical modification
Billable codes under I21.1
I21.1 can’t be reported on its own. Choose the code below that matches what the note documents.
Where I21.1 sits
- 1
Chapter 9
Diseases of the circulatory system (I00-I99)
- 2
Section
Ischemic heart diseases (I20-I25)
- 3
Category I21
Acute myocardial infarction
- 4
Code I21.1
ST elevation (STEMI) myocardial infarction of inferior wall
Notes for this code
Inclusion terms
- Type 1 ST elevation myocardial infarction of inferior wall
Code first
No “code first” instruction is listed for I21.1.
Use additional code
No “use additional code” instruction is listed for I21.1.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for I21.1.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for I21.1.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code I21.1 mean?
I21.1 is the FY 2027 U.S. ICD-10-CM code for “ST elevation (STEMI) myocardial infarction of inferior wall.”
Is I21.1 a billable or specific ICD-10-CM code?
No. I21.1 has 2 billable codes beneath it in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is I21.1 located in ICD-10-CM?
I21.1 is listed in Chapter 9, Diseases of the circulatory system (I00-I99), within Ischemic heart diseases (I20-I25) (I20–I25), under category I21, Acute myocardial infarction.
What coding notes are listed for I21.1?
Its listed inclusion terms are Type 1 ST elevation myocardial infarction of inferior wall. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.