Health insurance; ensuring fairness in cost-sharing. Amends provisions related to rebates provided by carriers and health benefit plans to health plan enrollees by defining defined cost-sharing, price protection rebates, and pharmacy benefits management services. The bill requires that an enrollee’s defined cost-sharing for each prescription drug shall be calculated at the point of sale based on a price that is reduced by an amount equal to at least 80 percent of all rebates received or expected to be received in connection with the dispensing or administration of the prescription drug.