Emergency room doctors in Georgia are suing health insurer Anthem Blue Cross Blue Shield for refusing to cover certain medical services that the company determined didn’t constitute an emergency.

The lawsuit was filed Tuesday in U.S. District Court in Atlanta by the Medical Association of Georgia and the American College of Emergency Physicians. It asks Anthem to rescind an emergency room policy retroactively denying medical coverage for patients who receive ER care, and to pay the claims it has denied.