ICD-10-CM > I00-I99 > I20-I25 > I24 > I24.8 I24.8 Other forms of acute ischemic heart disease Non-Billable/Non-Specific Type 1 Excludes myocardial infarction due to demand ischemia (I21.A1) Codes I24.81Acute coronary microvascular dysfunctionI24.89Other forms of acute ischemic heart disease