The Trump administration’s proposal that health insurers be required to disclose the rates they negotiate with providers was immediately blasted by insurers, who said the rule if finalized would confuse patients with complex information and undermine competition. The proposal also would encourage new plan designs that incentivize consumers to shop for services from lower-cost providers by giving those insurers more favorable medical loss ratios. In addition to the 60-day public comment period on the proposed rule, the administration also asks...