Our site is currently unavailable from the European Union. If you need information about your plan, please call Customer Service between 7am and 5pm PST. Customer Service: +1 (800) 554-1907 Corporate Office: +1 (206) 522-1300 Connect with us Delta Dental Notice of Privacy Practices (NPP)Out of Country Claim Form © 2001 - 2018 Delta Dental of Washington. All rights reserved.