A bipartisan group of senators introduced a bill Thursday to ban "gag clauses" that can hide potential savings on prescriptions from consumers at the pharmacy counter.

The clauses, which keep pharmacies from proactively telling customers they could save money on a prescription if they paid out of pocket instead of through insurance, has sometimes been included in contracts between pharmacies, insurers and companies that manage drug benefits for employers called pharmacy benefit managers (PBMs).

“Insurance is intended to save consumers money. Gag clauses in contracts that prohibit pharmacists from telling patients about the best prescription drug prices do the opposite,” Sen. Susan Collins Susan Margaret CollinsGraham: GOP will confirm Trump's Supreme Court nominee before the election Gardner signals support for taking up Supreme Court nominee this year Tumultuous court battle upends fight for Senate MORE (R-Maine) said in a statement Thursday.

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Collins unveiled the bill going after gag clauses on Thursday along with Sens. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.), Debbie Stabenow Deborah (Debbie) Ann StabenowOVERNIGHT ENERGY: Trump rollbacks could add 1.8 billion tons of greenhouse gas emissions over 15 years: analysis | Intensifying natural disasters do little to move needle on climate efforts | Experts warn wildfire smoke could worsen COVID-19 GAO report finds brokers offered false info on coverage for pre-existing conditions Democrats back away from quick reversal of Trump tax cuts MORE (D-Mich.), John Barrasso John Anthony BarrassoMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (R-Wyo.) and Bill Cassidy William (Bill) Morgan CassidyCoushatta tribe begins long road to recovery after Hurricane Laura Senators offer disaster tax relief bill Bottom line MORE (R-La.).

The bill would prohibit insurers and pharmacy benefit managers from restricting a pharmacy's ability to tell customers the difference in price between a prescription purchased with insurance or out of pocket.

It would apply to plans offered through the individual market and by private employers.

Collins used the example of a customer using his insurance to pay $129 for a drug when he could have paid $18 out of pocket.

"Americans have the right to know which payment method — insurance or cash — would provide the most savings when purchasing prescription drugs," she said.

A recent study published in the Journal of the American Medical Association that reviewed 9.5 million insurance claims found that 23 percent of prescriptions filled through insurance ended up costing more for customers than if they would have paid out of pocket.

The overpayments totaled $135 million for 2013, or $10.51 per covered member on average.

The study noted that some pharmacists are contractually prevented from alerting patients when their copay exceeds the drug's out-of-pocket price.

A second bill introduced by Barrasso and Cassidy with Sen. Ron Wyden Ronald (Ron) Lee WydenGOP set to release controversial Biden report Democrats fear Russia interference could spoil bid to retake Senate GOP senator blocks Schumer resolution aimed at Biden probe as tensions run high MORE (D-Ore.) would provide the same protections for individuals covered by Medicare Advantage and Medicare Part D.

The Pharmaceutical Care Management Association, which represents PBMs, said the issue has already been addressed in the marketplace.

“We support the patient always paying the lowest cost at the pharmacy counter, whether it’s the cash price or the copay. This is standard industry practice in both Medicare and the commercial sector," PCMA said in a statement.

"We would oppose contracting that prohibits drugstores from sharing with patients the cash price they charge for each drug. These rates are set entirely at the discretion of each pharmacy and can vary significantly from drugstore to drugstore. Fortunately, to the degree this issue was ever rooted in more than anecdotal information, it has been addressed in the marketplace.”

A 2016 survey from the National Community Pharmacists Association found that 59 percent of pharmacists surveyed had encountered a gag clause at least 10 times in the last month.

The bill comes as Congress and the Trump administration ratchet up their scrutiny of rising drug prices, especially the role that pharmacy benefit managers play.

Food and Drug Administration Commissioner Scott Gottlieb criticized pharmacy benefit managers last week for not passing along the savings they get from rebates from drug manufacturers on to customers.