A federal judge in Connecticut on Thursday denied Cigna Health & Life Insurance Co.’s motion to dismiss a potential class action alleging the mega-insurance company engaged in a scheme to defraud customers by overcharging them—in some cases more than 100 percent—for services and products.

U.S. District Judge Warren Eginton of the District of Connecticut let nine of 12 counts against Cigna stand, and ordered plaintiffs attorneys to file an amended complaint with the remaining nine claims within three weeks. The surviving claims against Cigna include allegations of violations of the Employment Retirement Income Security Act, or ERISA, and the Racketeering Influenced and Corrupt Organizations Act, or RICO.