I've had a number of fights with my insurance company over paying for hospital bills for physical therapy. I'm sure after the hospital bills my insurance company put me high on their target list. I've even got a bit of upcoming surgery that after initial rejection my insurance company sent me a letter stating something like, "we weren't wrong to reject you, but I guess we'll pay this time." I only got that letter after a written appeal signed by me and my family.
As far as I'm concerned I'm voting for national health insurance. Insurance shouldn't be a private business who's only concern is making money.