You will need to contact both the Alliance and your county’s Medi-Cal office if you move or change your phone number. To inform the Alliance, use the Update Personal Information form or call Member Services at the Alliance. Use the numbers below to contact your county’s Medi-Cal Office: Merced County 209-385-3000 855-421-6770 Monterey County 877-410-8823 Santa Cruz County 888-421-8080