There should be an anti price gouging law which states that a doctor can only change their prices every month or something, and must publish them publicly. This could also include stats indicating with which percentage what procedures are done for a specific complaint. Ex, for a head injury, in 50% of cases an MRI was done at cost X.

Then we could all use our internet connected phones to find the price instantly. If we are unconscious or decapitated at the time, we could set up a set up a ranking system beforehand weighing price, distance to hospital, and quality of service ratings.