Rochester Gastroenterology Associates 103 Canal Landing Blvd., Suite 12 Rochester, NY 14626 Tel: (585) 227-1080 Fax: (585) 723-7709. Penfield office. Rochester Gastroenterology Associates 20 Hagen Drive, Suite 330 Rochester, NY 14625 Tel: (585) 267-4040 Fax: (585) 267-4044.