On or after January 1, 2005, an insurer, employer, or entity that provides physician network services may establish or modify a medical provider network for the provision of medical treatment to injured employees. Commencing January 1, 2014, every medical provider network shall post on its Internet Web site a roster of all treating physicians in the medical provider network and shall update the roster at least quarterly. Physician compensation may not be structured in order to achieve the goal of reducing, delaying, or denying medical treatment or restricting access to medical treatment.