I21.9 ICD-10-CM Code: Acute myocardial infarction, unspecified
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
I21.9Acute myocardial infarction, unspecified
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where I21.9 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 I21.9
Acute myocardial infarction, unspecified
Documentation details
Notes for this code
Inclusion terms
- Myocardial infarction (acute) NOS
Code first
No “code first” instruction is listed for I21.9.
Use additional code
No “use additional code” instruction is listed for I21.9.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for I21.9.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for I21.9.
Transparency
Source and release
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.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code I21.9 mean?
I21.9 is the FY 2027 U.S. ICD-10-CM code for “Acute myocardial infarction, unspecified.”
Is I21.9 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, I21.9 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is I21.9 located in ICD-10-CM?
I21.9 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 I21.9?
Its listed inclusion terms are Myocardial infarction (acute) NOS. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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