Dr. John F. Ryan is an internist in Lake Mary, Florida and is affiliated with multiple hospitals in the area, including Orlando Health-Orlando Regional Medical Center and AdventHealth Orlando. He received his medical degree from State University of New York Downstate Medical Center College of Medicine and has been in practice for more than 20 years. Dr. John F. Ryan has expertise in treating hypertension & high blood pressure, depression, diabetes, among other conditions - see all areas of expertise. Dr. John F. Ryan accepts Medicare, Blue Cross, United Healthcare - see other insurance plans accepted. Dr. John F. Ryan is highly recommended by patients.