Pacific Health Care Organization, Inc. is engaged in managing and administering health care organizations (HCOs) and managed provider networks (MPNs) in the state of California. The Company offers an integrated and layered array of complementary business solutions that enable its customers to manage their employee worker compensation-related healthcare administration costs. Its services include providing customers access to its HCOs and MPNs. It also provides medical case management, medical bill review, employee advocate services, utilization review, workers' compensation carve-outs and Medicare set-aside services. In addition, it also provides expert witness testimony. It offers its services as a bundled solution, as standalone services, or as add-on services. Its customers include self-administered employers, insurers, third party administrators, municipalities, and others. The Company's subsidiaries include Medex Healthcare, Inc., Medex Medical Management, Inc., and others.