To ensure your family members continue their coverage on your King County medical, dental, or vision plan, please verify their eligibility by submitting documentation to Mercer. This dependent eligibility verification process must be completed by July 29, 2024, for each person enrolled to make sure they do not lose coverage on Sept. 30, 2024. The verification process can take a few days so don’t leave it to the last minute! If you have coverage questions, please contact King County Benefits.

Access the Mercer Secure Website to check your verification progress and submit documents. If you haven’t logged in to the Mercer site yet, you will need your Audit ID sent to you by Mercer Consulting by mail and email. If you can’t find your Audit ID, please call Mercer at 866-703-3763. You can also submit paper copies of your documents to Mercer at: Dependent Eligibility Verification, P.O. Box 14585, Des Moines, IA 50306-3585. Be sure to block out personal financial data and Social Security numbers before submitting documents.

More information

• Dependent Eligibility Verification FAQ
• Dependent Eligibility Verification Website Demo
• Overview video: in English, Korean, Punjabi, Russian, Simplified Chinese, Spanish, Ukrainian, or Vietnamese
• Contact Mercer at 866-703-3763.