I don't like it because it's not how market economies are supposed to work, but we absolutely need strict controls on pricing. For example: instead of allowing them to charge 4000$ for an ambulance ride, set the limit to something more reasonable, say 100-300$ depending on the COL in that area.
Also, expanding the labor supply of doctors and nurses would also help. Right now, there are strict limits on the # of doctors that can be made.