The Board and the Department of Human Resource Management, as administrator of the Commonwealth’s self-insurance program for workers’ compensation coverage, shall jointly develop guidelines and procedures for the coordination of benefits and case management for participating employees entitled to benefits under the Act and supplemental disability benefits under this article. Such guidelines shall also address disability benefits for participating employees whose disability results from multiple injuries or illnesses, one or more of which is a work-related injury. The Board shall have the authority to approve the final guidelines and procedures.