I do not understand why there is no public list online with the basic costs of operations (including all the variables). With price transparency a lot of this unequal treatment and prices would surface. I understand there are a lot of variables, but not like it wouldn't be possible. (I understand a treatment at Hopkins would be more expensive than say at your local hospital, but at the very least it would be clear how much more expensive it actually is.
EDIT: One way to do it nationwide would be to ask people to send in their bills (anonymized).