2025
ICD-10-CM
Diagnosis
Code

I21.A9 Other myocardial infarction type

  • Billable
  • 2018–2025

I21.A9 is a billable/specific diagnosis code from the 2025 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-)

Versions

  1. 2025

    No changes

  2. 2024

    No changes

  3. 2023

    No changes

  4. 2022

    No changes

  5. 2021

    No changes

  6. 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-)

  7. 2019

    No changes

  8. 2018

    New code