Wash. Admin. Code § 284-51-235
A plan must include the following statement in the enrollee contract or booklet provided to covered persons:
"If you are covered by more than one health benefit plan, and you do not know which is your primary plan, you or your provider should contact any one of the health plans to verify which plan is primary. The health plan you contact is responsible for working with the other plan to determine which is primary and will let you know within thirty calendar days.
CAUTION: All health plans have timely claim filing requirements. If you or your provider fail to submit your claim to a secondary health plan within that plan's claim filing time limit, the plan can deny the claim. If you experience delays in the processing of your claim by the primary health plan, you or your provider will need to submit your claim to the secondary health plan within its claim filing time limit to prevent a denial of the claim.
To avoid delays in claims processing, if you are covered by more than one plan you should promptly report to your providers and plans any changes in your coverage."
Wash. Admin. Code § 284-51-235
Statutory Authority: RCW 48.02.060, 48.21.200, 48.44.050, and 48.46.200. 09-16-073 (Matter No. R 2008-20), § 284-51-235, filed 7/30/09, effective 9/1/09; 07-13-008 (Matter No. R 2005-07), § 284-51-235, filed 6/8/07, effective 7/9/07.