Dr. Fred Grunseid is an internist in Brooklyn, New York and is affiliated with multiple hospitals in the area, including Maimonides Medical Center and Brookdale Hospital Medical Center. He received his medical degree from Icahn School of Medicine at Mount Sinai and has been in practice for more than 20 years. Dr. Fred Grunseid has expertise in treating bronchitis, hypertension & high blood pressure, diabetes, among other conditions - see all areas of expertise. Dr. Fred Grunseid accepts Medicare, Aetna, Blue Cross, United Healthcare - see other insurance plans accepted. Dr. Fred Grunseid is highly recommended by patients.