This is one of the most annoying statistics to hear cited, because it is most commonly misused in the way you're doing not - to argue that our expenditures are higher because of some problem with our system.
Yes, per capita healthcare spending in the US is significantly higher that in is in most other countries. Why? It's not due to inefficiencies or private insurers, but is almost exclusively due to the fact that
we're full of obese people.
http://www.nytimes.com/2009/09/10/opinion/10pollan.html
Do you see the difference? We could install a carbon copy of whatever European UHC program you think is best,
and we would still be paying almost twice what every other country pays.
If you want to criticize our health care system, please do so based on the actual problems with it, not based on factors that will remain unchanged under any system.