Good points, but crafting (Federal?) legislation to accomplish that is a real headache.
One challenge is distinguishing expensive from what you referred to as “outrageous”. That evaluation alone requires the time of experts which costs money. Which party pays for that, not to mention the cost of care/compensation resulting from the rendered decision?
Next, how are disputed decisions settled if not in court or through arbitration and at whose expense (socialized law, perhaps?)?
Costs not borne by either the practitioner or the patient (or the corresponding insurer) falls to the government (taxes), so we have now segued into the debate about socialized medicine.
As with most things, the devil is in the details.