Member Services

MDCO is pleased to be your dental plan of choice. MDCO Member Services is here to help you. We are available Monday through Friday from 7:00 a.m. to 7:00 p.m. for assistance. Please contact us at 1-800-538-9604 with any questions and for 24-hour dental emergency help.

  • DO call MDCO Member Services at 1-800-538-9604 with questions.
How To
  • File a complaint – You may file a complaint in writing or by telephone. If you would like to file in writing, please mail your complaint to MDCO, 3000 Market St. NE, Suite 222, Salem, OR 97301, or email it to
  • File an appeal or administrative hearing – You may file an appeal or an administrative hearing request within 45 days of the notice of action date. Appeal and administrative hearing requests must be filed in writing, and can be mailed, faxed, or emailed to MDCO or your local DHS branch office.
  • Contact MDCO:
    By Phone: 1-800-538-9604
    By Email:
    By Fax: 503-581-0043
    By Mail: 3000 Market St. NE,  222, Salem, Oregon, 97301