Martinez Health Center. 2500 Alhambra Avenue, Martinez, CA 94553. 1-800-495-8885 (Appointments) 1-877-905-4545 (Information) 925-370-5300 - Dental Clinic Appointments. 925-370-5320 - Diagnostic Imaging Appointments. 925-370-5260 - Cardiopulmonary Appointments. - Phone Numbers for Primary Care Providers..