I21 - ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
I21.2 - ST elevation (STEMI) myocardial infarction of other sites
I21.21 - ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
I21.29 - ST elevation (STEMI) myocardial infarction involving other sites