(a) For the purposes of this section, the following words shall have the following meanings unless the context clearly requires otherwise:

''Cost-sharing'', an amount owed by an individual under the terms of the individual's health benefit plan.

''Health benefit plan'', as defined in section 1 of chapter 176O.

''Pharmacy benefit manager'', as defined in section 1 of chapter 176Y.

''Pharmacy retail price'', the amount an individual would pay for a prescription drug at a pharmacy if the individual purchased that prescription drug at that pharmacy without using a health benefit plan or any other prescription medication benefit or discount.