#1 healthcare cost = lawyers/lawsuits. Not going to get congress critters to limit lawsuits.
Not even close to the anti competitive price fixing and lack of price disclosure for services.
That used to be true. I'm not sure if it still is. A larger issue today appears to be fake pricing and the consolidation of medical providers into larger and larger groups.
It is nearly impossible now to determine actual prices, and real "costs" for medical services due to the wildly inflated prices everywhere in the system. Much of the high cost of medical care is actually faked, with hospitals and others willingly accepting pennies on the dollar for their services. But the fake prices and "discounts" are what insurance companies and hospital groups use to force consumers to have insurance.
Rampant over-use of expensive tests and medications is another major cost driver. Few generalists practice today, so diagnosis becomes a series of expensive tests by a whole panel of specialists.