Having recently ended up in a US hospital, having been told that I was having a heart attack, stupidly saying I was insured and then undergoing several expensive (US$16,000) heart tests and being told I needed a triple bypass, I'm pleased I mentioned that I didn't think my insurance stretched to bypasses, I was discharged within 2 hours. My travel insurance were very good in that they were all set to get me flown home with a nurse and everything, until I explained that the first test which indicated a heart attack (which I didn't believe anyway) was not confirmed by three further identical tests (troponin levels) which I had in hospital.
My GP reviewed all 38 pages of documentation she received from the hospital and said she had paid careful attention to the cardiologist's comments and said I didn't need a bypass. I already knew that the tests had shown my heart was as strong as an ox, but my arteries were that of a 60 year old (goody, I'm 64).
I'm not suggesting that all US MDs are corrupt, but there are several cases ongoing where MDs have referred patients for unnecessary surgery.
Give me the good old NHS any day, they are not influenced by money, probably because there isn't any.