I have to say: I lived in Canada for three years. One the one hand, the day to day costs of medical care was fairly inexpensive. During that time, my wife had an eye illness that was somewhat unique and costs for treatment were low. On the other hand, I knew a fair number of physicians and they were not always happy about the government controlled arrangements.
That said, as I understand it, the Canadian system requires all physicians to work within set government controlled limits on patient costs, and to stay within the government system. But after a certain number of years (ten?) they can essentially go public.
In the US there is the vicious circle of insurance fraud, medical malpractice expenses, and the constant threat and fear of litigation. All of this adds up. Add to this the phramaceutical companies spending on ads and commercials to 'guide' consumers (oops!, I mean "patients") to their products.
I have some fears about a government controlled health care system. Regulation reform regarding liability, accountability, and cost containment would be preferable, IMO.