Even getting routine care, I've had 0% success gaining any transparency at all. Maybe it works for generic GP services, but for imaging or other testing, I've tried and completely failed. "Contact our billing department and they may be able to tell you" is the best answer I get.
I'm ready to vote for forced transparency at all levels. I'm tired of this opaque negotiated pricing with insurance companies that manages to maximize my out-of-pocket costs.