For alleged antitrust violations. Per the Charlotte Observer:

Three months after the state and federal and government sued Carolinas HealthCare System over alleged antitrust violations, a San Francisco law firm has filed a class action lawsuit alleging the hospital system engaged in illegal and anti-competitive actions.

The suit named Mecklenburg County resident Christopher DiCesare as its lead plaintiff, but gave no specifics about how he was damaged, except to say he’s a customer of Cigna Healthcare of North Carolina, one of four large companies that provide 85 percent of the commercial insurance in the Charlotte area.

In its June antitrust suit, the federal Department of Justice and the state attorney general claimed Carolinas HealthCare has driven up health care costs through illegal efforts to prevent competition.