5 Cuba Hill Road East Entrance - Suite 200 West Entrance - Suite 100 Greenlawn, NY 11740. Phone: 631-628-5000. 631-628-5000. Mount Sinai Doctors-Long Island Heart. Address: 200 Old Country Road Suite #278 Mineola, NY 11501. 200 Old Country Road Suite #278 Mineola, NY 11501..