CONTACT INFORMATION: Our administration office at 10777 Main Street in Fairfax is open during regular business hours 8 a.m. Contact DentaQuest at 1-888-912-3456 or search the DentaQuest website to find a listing of dentists who accept Medicaid in your zip code.Get an application mailed to you. To find out your dental insurance benefits, please call our office. You may call or visit any of our Department of Family Services offices to apply for Medicaid. Our office hours are 8 am to pm, Monday through Friday. People Who May Be Eligible For Medical Assistance. Create an account with the Health Insurance Marketplace and fill out an application. People already enrolled in Medicaid do not need to do anything extra to sign up for dental coverage.