4. UnitedHealthcare was ready to terminate its contract with Envision in April. At the time, UnitedHealthcare argued Envision wrongfully sued the payer and by doing so broke an arbitration clause in their agreement. The insurer also called Envision's emergency room billing practices "egregious." In March, Envision sued UnitedHealthcare for allegedly lowering contracted payments to Envision physicians and not allowing new Envision medical practices to join its network.