The review presents current data on the prevalence of diabetes in the cohort of patients undergoing coronary artery bypass grafting. The relevance of active approach to the identification of diabetes and prediabetes in patients with coronary artery disease (CAD) before coronary revascularization is reviewed. Recent information about the negative impact of diabetes on the prognosis of myocardial revascularization is reported as well as the main mechanisms responsible to the development of adverse outcomes of interventions in these patients. Target perioperative values of glycemia recommended by the leading associations of the study of diabetes have been compared. Beneficial potential of other carbohydrate metabolism markers (glycated hemoglobin, fructosamine, 1,5-anhydroglucitol) in patients with diabetes mellitus (DM) in terms of their impact on cardiovascular prognosis, including coronary intervention. The results of studies comparing different management strategies for these patients are reviewed. The significance of carbohydrate metabolism compensation during myocardial revascularization is reported; thus, a too stringent glycemic control has no benefits neither for percutaneous nor for open coronary intervention. Recent trials suggest the groups of antidiabetic drugs and evidence of their impact on the cardiovascular system. The importance of comprehensive monitoring of major risk factors in diabetic patients with coronary intervention has been proved.