RCW 48.21.280: Coverage for adopted children.

(1) Any group disability insurance contract, except a blanket disability insurance contract, providing hospital and medical expenses and health care services, delivered or issued for delivery in this state, which provides coverage for dependent children, as defined in the contract of the insured, shall cover adoptive children placed with the insured on the same basis as other dependents, as provided in RCW 48.01.180.

(2) If payment of an additional premium is required to provide coverage for a child, the contract may require that notification of placement of a child for adoption and payment of the required premium must be furnished to the insurer. The notification period shall be no less than sixty days from the date of placement.