You have to ask yourself what makes healthcare unique to nearly every other well functioning market in the US. The bigger issue is there is third party paying for things. Try to ask your doctor how much something costs and they'll stare at you like you have two heads. Imagine getting your car fixed without knowing how much it's going to cost
The other problem is the regulation and groups like AMA. Why don't new cardiologists enter the field? Because there is a cap of graduates that the AMA controls. Why doesn't a new hospital open up? Because there is often a "certificate of need" to open a new health care facility and other health care providers in the vicinity get to determine who is allowed in.
What would happen to restaurants if new waiters had to go to school for 8 years and there was a cap on how many can graduate and you need to go to a board of neighboring restaurants to decide if you can open yours, and diners are forced to sign up for some company to pay for all the meals.