St. Luke's has joined a handful of hospitals suing one of the largest health insurance networks in the country. The class action lawsuit is accusing Blue Cross Blue Shield of not paying market rates for services. This is not the first time Blue Cross Blue Shield has faced a lawsuit like this. Last year, after years of litigation the company agreed to a $2.8-billion settlement in a federal court in Alabama. However, not every state agreed to the settlement; Pennsylvania being one of them.