Knowing how much different procedures cost only matters if you have free choice of who is performing it. Which you don't.
Your insurance dictates a set of doctors and hospitals you can use. But then if you go to those doctors or hospitals they subcontract to other companies, but then .. don't actually subcontract, they pretend you have a relationship with the subcontractor, and let them bill you directly as if you chose them.
That's why a year after I spent a couple of months in hospital I am still getting random bills from an anesthesiology company. It's win-win for everyone except the patient: each player pretends you're getting a separate treatment, so each one has a copay (saving your insurance company money), and each one gets to give you separate bill, and if they're incorrect you have to fight each one individually, making the individual companies more money.