MyChart is secure—we take great care to ensure your information is kept protected and private. For more information about MyChart and how to sign up, talk to provider's office. You can also call our toll-free support number at 1-844-622-5465 or email mychart.support@cchealth.org . MyChart Sign Up for MyChart Family Access.Sign Up for MyChart‧Family Access‧Regional Medical Center‧Health Centers & Clinics‧Contra Costa Health Plan‧MyChart - Patient Website.