Acute coronary syndromes (ACS), including ST Elevation Myocardial Infarction (STEMI), is the most responsible reason for cardiac deaths. All adverse events, including death, can be reduced with the correct, rapid diagnosis and appropriate treatment options. For this purpose, risk scoring has been developed and used in daily practice. In our study, we aimed to evaluate the place of risk scores used to assess mortality in STEMI patients in predicting coronary artery disease (CAD) severity. In our study, 293 STEMI patients were enrolled. These patients underwent coronary angiography, and GRACE, TIMI, Zwolle, PAMI, CADILLAC risk scores, and SYNTAX score (SS) were calculated. The specific ability of mortality risk scores was assessed using the area under the curve or the C statistical method. The number of patients with high SS was 112 (%38.2). Compared to the ROC curves of the risk scores in determining the presence of severe CAD, all of the results were significant, similar, and highly predictive. The 'area under the curve values of severe CAD, TIMI, Zwolle, PAMI, and CADILLAC were found to be 0.658, 0.675, 0.716, 0.679, and 0.703, respectively. (p<0.001). Mortality risk scores were similar, significant, and effective in predicting high SS, the highest rate being the Zwolle score , in patients admitted to our clinic with STEMI. Using these risk scores in a simple and fast way before and after coronary angiography will provide an essential benefit for predicting mortality and predicting the presence and severity of CAD.