Other myocardial infarction type
- I21.A9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2025 edition of ICD-10-CM I21.A9 became effective on October 1, 2024.
- This is the American ICD-10-CM version of I21.A9 – other international versions of ICD-10 I21.A9 may differ.
Applicable To
- 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-)
The following code(s) above I21.A9 contain annotation back-references
that may be applicable to I21.A9:
- I00–I99 Diseases of the circulatory system
- I20-I25 Ischemic heart diseases
- I21 Acute myocardial infarction
ICD-10-CM I21.A9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):
- 280 Acute myocardial infarction, discharged alive with mcc
- 281 Acute myocardial infarction, discharged alive with cc
- 282 Acute myocardial infarction, discharged alive without cc/mcc
- 283 Acute myocardial infarction, expired with mcc
- 284 Acute myocardial infarction, expired with cc
- 285 Acute myocardial infarction, expired without cc/mcc
Convert I21.A9 to ICD-9-CMCode History
- 2018 (effective 10/1/2017): New code
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): No change
- 2024 (effective 10/1/2023): No change
- 2025 (effective 10/1/2024): No change
Code annotations containing back-references to I21.A9:
- Type 1 Excludes: I22
Diagnosis Index entries containing back-references to I21.A9: