Sierra Vista Regional Medical Center Health Information Management Department 1010 Murray Ave. San Luis Obispo, CA 93405 Phone: (805) 546-7636 Fax: (805) 546-7953 Radiology: (805) 546-7676. Sierra Vista Records Authorization Form. Twin Cities Community Hospital Health Information Management Department 1100 Las Tablas Rd. Bldg. 1220, Ste. 1427 ....