It's hospital policy. I have access to hard copies, but unfortunately, it's for employees only, so I won't be posting it. I'm not saying that's how it goes 100% of the time, but if it's in the hospitals documentation that she acquired something while she was there (that was preventable), and the insurance company wants to pursue it, then it's on the hospital to cover the cost since it was 'their fault'.
Take it or leave it, that's the way it is.