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). The department shall use income eligibility standards and eligibility determinations applicable to children placed in foster care. The department, in consultation with the health care authority, shall provide information regarding basic health plan enrollment and shall offer assistance with the application and enrollment process to individuals covered under RCW 74.09.510(3) who are approaching their twenty-first birthday.