>Maybe these aren't the "true prices"? I certainly wouldn't know where to look to find how much a "knee surgery" would cost, and I'd probably need to know some obscure medical code I don't have access to, as well as the intricacies of the knee surgery to know exactly what price to look up. I don't know how publishing "true prices" would work.

This is exactly the problem. They publish "prices" but those prices don't mean anything.