Enroll in the Patient Portal. If you are a new or established patient of Core Physicians, you can choose one of three ways to enroll in the Patient Portal: 1. Visit any Core Physicians' office 2. Call our Customer Service line at 603-580-6753 (Weekdays, 7:30am - 5:00pm) 3. Complete an Online Enrollment FormOnline Bill Pay‧Send an Email‧Enrollment Form‧Personal Health Record (Phr)‧Book Online‧Find a Provider.