Out of State Patient Info. Practice Information. Dr. Shawn Khodadadian has either authored or reviewed and approved this content. Manhattan Gastroenterology Locations: Manhattan Gastroenterology (Upper East Side) 983 Park Ave Ste 1D, NY 10028. (212) 427-8761 Manhattan Gastroenterology (Midtown) 51 East 25th Street Ste 407, NY 10010. (212) 533 ....