Patient Hospital and Physician Bills ChristianaCare assists patients with all questions related to hospital bills. Customer Service business hours are: 8 a.m. - 6 p.m., Monday through Thursday, 8 a.m. - 5 p.m. Friday and 9 a.m. - 2 p.m. Saturday. To speak with a Customer Service representative, please call 302-623-7000 or e-mail patientpay@christianacare.org. If […].