Dr. Joshua R. Olstein is a gastroenterologist in New City, New York and is affiliated with multiple hospitals in the area, including Good Samaritan Regional Medical Center-Suffern and Montefiore Nyack Hospital. He received his medical degree from University of Pittsburgh School of Medicine and has been in practice for more than 20 years. Dr. Joshua R. Olstein has expertise in treating colonoscopy, upper gi endoscopy, gastroenteritis, among other conditions - see all areas of expertise. Dr. Joshua R. Olstein accepts Medicare, Aetna, Humana, Cigna, Blue Cross - see other insurance plans accepted.