Acute subendocardial myocardial infarction
Non-Q wave myocardial infarction NOS
Nontransmural myocardial infarction NOS
Type 1 non-ST elevation myocardial infarction
Acute non-st segment elevation myocardial infarction
Heart attack
A myocardial infarction in the absence of observable q wave abnormalities in the ecg.
I21.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
The 2023 edition of ICD-10-CM I21.4 became effective on October 1, 2022.
This is the American ICD-10-CM version of I21.4 – other international versions of ICD-10 I21.4 may differ.