Manage Your Health Care Online With MySite » Beth Israel . Rentals Details: To register for the NEW MySite, have your medical record number ready. To obtain your medical record number, contact Patient Portal Support at 617-313-1278 or [email protected]bidmc.harvard.edu, Monday - Friday, 8:30 a.m. - 5:00 p.m. Be sure to specify whether you are referring to … mysite.