(January 10, 2018, 2:44 PM EST) -- WASHINGTON, D.C. — Citing the pending oral arguments in two appellate cases addressing the issue, a federal judge on Dec. 21 stayed an insurer’s challenge to alleged underpayments in the Patient Protection and Affordable Care Act (ACA) risk-corridor program (Montana Health Co-Op v. The United States, No. 16-1427C, Fed. Clms.)....