WAYNE, Pa.--(BUSINESS WIRE)--GENEX Services, LLC (GENEX), one of the nation's largest providers of managed care services, announced today that it has acquired M Hayes, a leading case management firm for the workers' compensation and disability insurance markets. Financial terms were not disclosed. "Our acquisition of M Hayes underscores GENEX's strong commitment to clinical services and the critical role they play in controlling medical costs and disability duration," said Peter Madeja, CEO and