About Syed Z Hussain, MD Dr. Syed Z. A. Hussain, MD MD (he/him) is a gastroenterologist in East Setauket, NY. As a new or existing patient, you can schedule an in-person appointment or schedule a telehealth appointment with Dr. Hussain, MD online. As a gastroenterologist, he may specialize in Cancer and Autoimmune Hepatitis, in addition to other conditions. According to our records, Dr. Hussain, MD performs Large Intestine Endoscopy, Upper GI Endoscopy, and other procedures. For insurance coverage, he accepts Medicare*. Dr. Hussain, Md has been practicing for over 19 years since getting his license to practice in New York.