· New York Gastroenterology Associates Patient Portal. ... 201 East 93rd Street New York, NY, 10128 Phone: (212) 897-1006. View Surgery Center Our Patient Offices. Upper East Side 68 E 86th Street New York, NY, 10028 ... New York Gastroenterology Associates (NYGA) is a premier independent gastroenterology practice in New York City. ....