It's almost all the result of the extra administrative overhead from our fragmented insurance market, profits to the for-profit hospitals and insurance companies and the extremely expensive ineffective end-of-life care that is incentivized by that incredibly messed up system.
Yeah but that'd all seem to be from private individuals, which seems to fit with my idea of a US that is more than happy to collectivly suffer, as long as folks don't feel anyone is getting a free ride.
It's a stupidly short sighted game of russian roulette but nowhere near as hilarious as if the Government itself really does pay out more per capitita than anywhere else in the world.