MIAMI BEACH (CBSMiami) – The exact amount hospitals charge for procedures has been a closely guarded trade secret for decades. But that is changing due to rules in President Barack Obama’s Affordable Care Act.

Medicare recently revealed how much hospitals bill the government insurer for procedures and how much Medicare actually pays for the billed procedure. The numbers showed sometimes wide cost discrepancies between facilities in the same area.

READ MORE: With Topic To Be Discussed At Special Meeting, Broward School Board Chair Says She’ll Vote Again In Favor Of Mandatory Masks

Still, Mount Sinai Medical Center is voluntarily taking things one step further. According to the Washington Post, Mt. Sinani’s chief executive Steve Sonnenreich said his hospital will reveal the rates the hospital pays private insurers as well as Medicare.

READ MORE: ‘This Is About Freedom’: Republican Leaders Gather At Versailles For Another Cuba Rally

According to MedCity News, Sonenreich made the promise while talking to WLRN, “We’ll post our prices relative to Blue Cross, and Aetna, our contractual prices, and we’ll challenge Baptist and the other systems in the community to do the same.”

As the Post explained, typically hospitals don’t want the information publicly known so that competitors don’t know the costs of the procedures and health plans don’t want each facility to know if they have given one hospital a better deal than others.

MORE NEWS: ‘2 Steps Forward, 1 Step Back’: South Florida Businesses Feeling Effects Of COVID Resurgence

Still, the Post said it may just be Mt. Sinai that makes the move. Baptist Health’s CEO Brian Kelley “has already demurred from matching Mount Sinai’s pledge,” the Post reported.