The fictional story “The Rainmaker” is about a fictional insurance company with a secret internal policy to deny all claims on first submission, and only fulfill some claims on appeal. It was meant to be fiction, but I suppose it’s not. This whole company should go down for fraud.
I think Cigna needs to be sued class action style for denials. I think it would probably work in the case where Cigna is operating as the claims administrator which is where your company self-insures (so they pay the claims) but Cigna just deals with the paperwork. I would not be surprised if Cigna advertises its services to large companies as "cost effective" etc...