I heard that Obamacare changed the way insurers are paid to more of a cost plus model. So they actually have an incentive to not push back against anything. D

I heard that Obamacare changed the way insurers are paid to more of a cost plus model. So they actually have an incentive to not push back against anything. Don't know if that's true. But if it is, who is pushing back against treatments? Doctors? Insurance companies? Government? Parents?