(1) Beginning January 1, 2021, the maximum amount a health carrier or pharmacy benefit manager may require a person to pay at the point of sale for a covered prescription medication is the lesser of:
(a) The applicable cost sharing for the prescription medication; or
(b) The amount the person would pay for the prescription medication if the person purchased the prescription medication without using a health plan.
(2) A health carrier or pharmacy benefit manager may not require a pharmacist to dispense a brand name prescription medication when a less expensive therapeutically equivalent generic prescription medication is available.
(3) For purposes of this section, "pharmacy benefit manager" has the same meaning as in *RCW
19.340.010.