CPT code 3021F indicates a documented left ventricular systolic dysfunction where the patient’s left ventricular ejection fraction (LVEF) is less than 40% or the left ventricular systolic function is described as moderately or severely depressed; this code is reported as a clinical measure of cardiac systolic impairment and typically accompanies cardiology evaluation and management services, often provided in inpatient hospital, cardiology clinic, or echocardiography imaging settings.