Cardiology Coding Alert

Reader Question:

Catch This Dx Code for MI Type 5

Question: Which ICD-10 code should I report for myocardial infarction (MI) type 5?

Alaska Subscriber

Answer: You should report I21.A9 (Other myocardial infarction type) for MI type 5. If you look under this code in the ICD-10 manual, you will see that MI type 5 is an included condition for I21.A9. Other included diagnoses with this code are as follows:

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

Important: Code I21.A9 has a few specific instructions for you to follow. You should code first any known complications, if applicable. The ICD-10 manual lists the following as examples: 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); and occlusion of coronary artery bypass graft (T82.218-).

Additionally, you should follow the Code first note related to postprocedural myocardial infarctions during (I97.790) or following cardiac surgery (I97.190).