A federal judge in Connecticut has denied most of Cigna Health and Life Insurance’s claims in its request to dismiss a lawsuit which alleges it artificially inflated prescription drug costs in violation of the health insurance policies of its clients.

The Monday ruling by U.S. District Judge Warren Eginton means the class-action lawsuit against both Cigna and OptumRx Inc. will move forward. The insurance giant hired OptumRx as its pharmacy benefits manager to negotiate drug prices on behalf of Cigna and the Cigna network.