R.I. Gen. Laws § 27-18-27: Adoptive children.

Subscribers to any accident and sickness insurance plan who have satisfied the continuous membership requirement of the plan and who adopt children under the guardianship and custody of the director of the department of children, youth and families shall be afforded coverage under the plan for an adopted child without any waiting period, notwithstanding the fact that the adopted child may have any preexisting medical condition.