The full U.S. Court of Appeals for the D.C. Circuit will consider a challenge to a key part of the Affordable Care Act—whether individuals buying health insurance on federally run exchanges can receive federal subsidies in the form of tax credits.

A divided D.C. Circuit panel in July ruled that individuals buying insurance through federal exchanges in the 36 states that declined to set up their own exchanges weren’t eligible to receive the credits. The U.S. Department of Justice asked the en banc court to reconsider the decision.

Arguments in Halbig v. Burwell are scheduled for 9:30 a.m. on Dec. 17, according to an order released Thursday morning by the appeals court.