This might have worked if everyone was required to buy from the market place and there were no employer plans. Obama's famous "You can keep your existing health coverage" was a terrible, terrible decision.
I watched the Medicare/Medicate group for my company and they might have complained about not getting enough money, but I really think they did. Things had fixed prices and there'd be plenty of money if BlueCross didn't spend money on advertising, useless wellness programs and shitty IBM technology.
Everyone should just get Meidcare/Medicade. The government won't control healthcare, it will just get contracted out to providers. They'll have to cut costs and not waste so much money (they waste A LOT!)
Capitalism + Health care is a failed experiment. Socialized health care does work, in every high income country that's not the United States. Australia fought against the Abbot government when they wanted to introduce copays. That's right, Australians don't have doctor co-pays (they kinda do now, but wavers are in place and the plan was effectively defeated).
The fact that the US government requires us to buy private health insurance at insane rates is absolutely insane and the Supreme Court should have struck it down. You are not a car. Your body shouldn't have a fee for existing.
[1] https://www.law360.com/articles/940691/fla-compounding-pharm...
[2] https://www.usatoday.com/story/news/politics/2016/04/27/huge...
Additionally, lots of doctors often bill incorrectly on purpose so that a particular services/procedure gets covered, so I am not sure we should keep "justified" and "validated" in these discussions.
You generally can't negotiate in advance though, because most providers seem unable or unwilling to tell you what anything is going to cost.