I21.A9: Other myocardial infarction type

I21.A9 is a billable/specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Other myocardial infarction type.

Inclusion term

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)

Code also

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-)

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Versions

2026
No changes
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
Code changed
- Code also
  ~~complication, if known and applicable, such as:~~
  ~~(acute) stent occlusion (T82.897-)~~
  ~~(acute) stent stenosis (T82.857-)~~
  ~~(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-)~~
  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-)
2019
No changes
2018
New code

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Inclusion term

Code first

Code also

Versions

2026

2025

2024

2023

2022

2021

2020

Code also

2019

2018

Inclusion term

Code first

Code also

Versions

2026

2025

2024

2023

2022

2021

2020

Code also

2019

2018