(1) Any health maintenance agreement under this chapter which provides coverage for dependent children, as defined in the agreement of the enrolled participant, shall cover adoptive children placed with the enrolled participant 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 agreement may require that notification of placement of a child for adoption and payment of the required premium must be furnished to the health maintenance organization. The notification period shall be no less than sixty days from the date of placement.