I21.A9

Billable

Other myocardial infarction type

I21.A9 is the ICD-10-CM code for Other myocardial infarction type. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
I00-I99
Parent
I21.A
Edition
FY2026

I00-I99 Diseases of the circulatory system

Includes

  • 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

Code first

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

Notes

  • 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-)

Frequently asked questions

What is ICD-10 code I21.A9?
I21.A9 is the ICD-10-CM code for "Other myocardial infarction type". It falls under I00-I99 Diseases of the circulatory system.
Is I21.A9 a billable code?
Yes — I21.A9 is a billable, specific ICD-10-CM code valid for reimbursement.

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

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