Something like this would be great. And the posted prices ought to include all complications / unexpected weird things -- they have the information (and the volume) to average such costs, you don't.

But not trivial to implement correctly. What exactly is the menu of procedures, and who standardizes (and updates) it? It would be much harder to comparison shop if there were a million entries (and every hospital offers a subset). Can hospitals select their patients, e.g. post great prices & outcomes by only accepting patients under 50 (or just with few other health issues)?