Medical provider networks (MPN) may be established by employers on or after Jan. 1, 2005. The City has not yet implemented a network. When the City implements an MPN, the network will consist of physicians chosen by the City to provide treatment for a work related injury. These doctors will also be rendering opinions regarding your ability to return to work, full duty or light duty. If the City uses an approved medical provider network, covered employees would receive their medical care in this network, unless a predesignated physician is chosen prior to an injury.