insurance info provided, is anyone responsibile for what they say?

First, you have a very cool site. Thank you for creating and maintaining it.

My questions revolve around health insurance and in network/out of network coverage.

Is the insurance company liable for insurance information they give out such as how to determine if a doctor is in network or not? Is the doctor's office liable for insurance information they give out (i.e. they are in network)?

Is there any way to force an insurance company to tell you the medical codes that were used in your EOB or why a procedure was deemed unnecessary?

Has anyone filed a class action against insurance companies over poor payment percentage and artificially low "Eligible charges" on out of network claims? (I would be interested in this).

Thank you.