Send payments to the following address: NorthBay Healthcare. PO Box 25376. Pasadena, CA 91185. Payments can also be made over the phone or at either hospital campus. The Patient Financial Services Office (Billing) is open Monday to Friday, 8:00 a.m. to 4:30 p.m. and is located at 4500 Business Center Drive in Fairfield (Green Valley area)..