I'd heard it goes on, but the insurance companies actually have teams of investigators trying to find any fault with your original application when you first signed up with them, and if there's any errors whatsoever, will simply refuse to pay - an absolute disgrace
Still, it's a business like any other I guess - just the price if higher when you're counting dead needlessly
Some reviews: http://www.rottentomatoes.com/m/sicko/
Exposes the U.S. as a very dangerous place to be any combination of poor, sick and old and suggests that the AMA ought to consider changing its Hippocratic oath from 'First, do no harm,' to 'First, check the wallet.'