Each health plan offered to public employees and their covered dependents under this chapter, including those subject to the provision of Title 48 RCW, and is issued or renewed beginning January 1, 2012, and provides coverage for cancer chemotherapy treatment must provide coverage for prescribed, self-administered anticancer medication that is used to kill or slow the growth of cancerous cells on a basis at least comparable to cancer chemotherapy medications administered by a health care provider or facility as defined in *RCW 48.43.005 (15) and (16).