Do a search in the search box or just go back a few pages. There was a recent thread entiled "Good GI Doctor in NYC" Most of the dr.'s were affiliated with Mount Sinai (where it all began). Also, some doctors are in private offices on the upper east side or around the city. Im sure you'd consider traveling a few more blocks for a good dr.
UPDATE: You should go to your insurance companies website or look up their roster of dr.'s and look under GI's and their addresses. If you really need it, ask here if pple know that doctor.
take care!