You can't, but the vast majority of US healthcare expenses are routine/primary care. If we have price transparency, then price sensitive individuals seeking routine care will drive prices down to a reasonable cost. Many emergency treatments are used in non-emergency situations, and charging a wildly different rate would certainly violate some price gouging law.
The debate around US healthcare often misses the point. We all agree it is too expensive. The next question we should ask is: how much does it cost? And the answer is we don't know. That is fundamentally an issue, because price discovery cannot occur if the price is unknown. Our current healthcare system is not a failure of capitalism; it is anti-capitalist. Collusion between big insurance, big pharma, and hospitals have captured the system.
We need robust price transparency legislation.