One thing to keep in mind is that the ideal supply and demand curves are boundary conditions, what supplier and consumer would charge and pay in a perfectly competitive markets.
Fact is, most are not perfectly competitive and have imbalances in the market forces that lean either towards the supplier or the consumer. Usually the supplier, but not always.
The supply and demand curves really put upper and lower limits on the supplier and customer prices. Customer's will happily pay less and suppliers will happily take more, if the market will bear this out. The supplier cost is an obvious lower bound. Suppliers can't sell below cost for very long.
The only thing that restricts the demand curve is the other markets, how much we have to spread around. I'll happily pay less, but at some point I have to have enough for food, housing, gasoline, etc. And property management companies know what minimum wage and Social Security pays. So, COLA goes up, up goes rents.
Still, say for instance the local service stations, act as oligopolies. I talked to one owner who said, "We don't get into price wars. That's just tacky." They price as high as the market will bear. They don't compete for the most customer's and don't price at rock bottom cost. They don't talk to each other, but they do watch each others prices. Those price signs aren't just for you and I. The advertisements that say, "will beat any price in town" aren't for you and me. Those are for the competition. The owner of the Shell station knows that the owner of the Arco knows that the Shell station owner knows that the Arco owner is watching Shell prices.
When insurance becomes part of it, the whole thing is up for grabs. Dentists typically charge different prices for insured than non-insured. The difference is that out of pocket is the same, they just get more when insurance is picking up a portion. A 50% deductible and I pay $1000 for a root canal and my insurance picks up $1000. No insurance and I get half off, so I pay $1000. And, frankly, that's the game and no-one can to otherwise because if they do, they get buried in the market.
As far as ACA goes, it is a hugely complex bill and if anyone says they know what is going to happen, they are fooling you, me and themselves.
Put in incentives like loan repayment programs to medical students and tuition costs will rise. Typically, the difference gets split. Like the Cash For Clunkers program... A $1000 rebate and price of autos went up. Depending on the elasticity of the supply and demand curves, it got split between buyer and seller. Depending on how many students take advantage of the loan repayment, the demand for professionals in the hard to fill geographic areas, and the increase in monies gets split up between saving students money and increasing profits to medical schools.
Having insurance companies capping operating expenses and profits to 20% keeps them from being a bottomless well for the rest of the industry. Still, that isn't going to be enough.
Medical device manufactures make bank. So implementing a medical device tax isn't going to increase the price of a $350 hip joint from $35,000 to $45,000. It won't happen.
Medicare is a huge player in the health care markets. So whatever Medicare does, it holds prices down. In a free market system, someone gets less for a lower price. The price of a McDonald's cheeseburger from the $1 menu keeps the price of a Wendy's hamburger down. Union wages at Safeway increase wages at the non-union Raley's.