Chronic ischemic heart disease Use additional code to identify:chronic total occlusion of coronary artery (I25.82)exposure to environmental tobacco smoke (Z77.22)history of tobacco dependence (Z87.891)occupational exposure to environmental tobacco smoke (Z57.31)tobacco dependence (F17.-)tobacco use (Z72.0)Excludes2non-ischemic myocardial injury (I5A)