- I21.3 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2024 edition of ICD-10-CM I21.3 became effective on October 1, 2022.
- This is the American ICD-10-CM version of I21.3 – other international versions of ICD-10 I21.3 may differ.
ICD-10-CM I21.3 is grouped within Diagnostic Related Group(s):
- 222 Cardiac defibrillator implant with cardiac catheterization with ami, hf or shock with mcc
- 223 Cardiac defibrillator implant with cardiac catheterization with ami, hf or shock without mcc
- 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
Applicable To
- Acute transmural myocardial infarction of unspecified site
- Transmural (Q wave) myocardial infarction NOS
- Type 1 ST elevation myocardial infarction of unspecified site
Code History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2016 (effective 10/1/2015): No change
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 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
- 2024 (effective 10/1/2022): No change
Diagnosis Index entries containing back-references to I21.3:
- Q wave (see also, Infarct, myocardium, by site) > myocardium, myocardial (acute) (with stated duration of 4 weeks or less) I21.9
- ST elevation (STEMI) > myocardium, myocardial (acute) (with stated duration of 4 weeks or less) I21.9