Well this comes as no surprise, give insurance providers (legalized mafia??) a little legislative support by making out of network harder to do and they take advantage. This was published by the American society of Anesthesiologists.
ASA Survey Shows Health Insurers Abruptly Terminating Physician Contracts, Dramatically Cutting Payment Rates Forcing Physicians Out of Network
ASA Survey Shows Health Insurers Abruptly Terminating Physician Contracts, Dramatically Cutting Payment Rates Forcing Physicians Out of Network