Provides that individuals eligible for medical assistance under RCW 74.09.510(3) shall be transitioned into coverage under that subsection immediately upon their termination from coverage under RCW 74.09.510(2)(a). In determining continuing eligibility for coverage of these individuals, the department shall use eligibility policies applicable to children covered under RCW 74.09.510(7). The department, in consultation with the health care authority, shall provide information regarding basic health plan enrollment to individuals covered under RCW 74.09.510(3) who are approaching their twenty-first birthday.