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2. ICD-10 Codes
3. Chapter - I00-I99
4. Section - I20-I25
5. Category - I21
6. I21.A9

I21.A9 - Other myocardial infarction type

• Applicable to Other myocardial infarction type
• The 2025 edition of ICD10-CM I21.A9 became effective on October 1, 2024.
• This is the American ICD10-CM version of I21.A9 - other international versions of ICD10 I21.A9 may differ.
• I21.A9 is a Billable / Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

• Myocardial infarction associated with revascularization procedure
• Myocardial infarction type 3
• Myocardial infarction type 4a
• Myocardial infarction type 4b
• Myocardial infarction type 4c
• Myocardial infarction type 5

codefirst

• , if applicable, postprocedural myocardial infarction following cardiac surgery (I97.190), or postprocedural myocardial infarction during cardiac surgery (I97.790)

codeAlso

• complication, if known and applicable, such as:
• (acute) stent occlusion (T82.897-)
• (acute) stent stenosis (T82.855-)
• (acute) stent thrombosis (T82.867-)
• cardiac arrest due to underlying cardiac condition (I46.2)
• complication of percutaneous coronary intervention (PCI) (I97.89)
• occlusion of coronary artery bypass graft (T82.218-)

The following codes above I21.A9 contain annotation back-references that may be applicable to I21.A9:

• Chapter: I00-I99 - Diseases of the circulatory system
• Section: I20-I25 - Ischemic heart diseases
• Category: I21 - Acute myocardial infarction

Browse other similar CM codes:

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.