Exchange issuers are cheering the Supreme Court’s decision to hear arguments over whether the government should be obligated to pay out roughly $12 billion under the Affordable Care Act’s risk corridor program, despite Congress’ move to block the payments. Issuers say that the heart of the case is whether the government can be trusted to live up to its contractual promises. The ACA’s temporary risk corridors program, which ran from 2014 through 2016, was designed to prevent issuers from seeing...