The two bills were passed by Congress last month. One bill is for Medicare and Medicare Advantage beneficiaries and the other for commercial-based and individual policies, NBC News reported.
Consumers with Medicare Part D drug insurance overpaid for prescriptions by $135 million in 2013, according to a study published in JAMA earlier this year.
For nearly one quarter of drugs bought that year, copayments in those plans were higher than the cash price. The study also found that for 12 of the 20 most commonly prescribed drugs, patients overpaid by more than 33 percent, NBC News reported.