Dr. Constantine Loannou is a psychiatrist in East Meadow, New York and is affiliated with multiple hospitals in the area, including Stony Brook University Hospital and Nassau University Medical Center. He received his medical degree from St. George's University School of Medicine and has been in practice for more than 20 years. Dr. Constantine Loannou has expertise in treating depression, among other conditions - see all areas of expertise. Dr. Constantine Loannou accepts Medicare, Aetna, Blue Cross, United Healthcare - see other insurance plans accepted.