William C. Passolt

OMS National Insurance Co. provides professional liability insurance to oral and maxillofacial surgeons (OMS). It provides coverage in situations, such as death of patients under various circumstances, diagnostic or therapeutic conditions resulting in injuries, incident or potential claims, contact by an attorney, receipt of a subpoena or suit papers, and contact by peer or state review agency. The company was founded in 1988 and is headquartered in Rosemont, IL.

Oms National Insurance Co. (Investment Portfolio) (OMSNIC-IP) is the investment portfolio division of Oms National Insurance Co., a professional liability insurance company headquartered in Schaumburg, Illinois. The firm provides comprehensive medical professional liability insurance coverage designed to protect the unique practice of oral and maxillofacial surgery. OMSNIC-IP manages the investment portfolio of insurance clients.

OMS National Insurance Co. Risk Retention Group provides liability insurance coverage. It offers risk management, defense, practice protection, and resident resources services. The company was founded on February 4, 1988 and is headquartered in Rosemont, IL.

Arthur Andersen LLP used to provide accounting services. It was also into consulting services for clients that operate businesses throughout the United States and around the world. Arthur Andersen was founded in 1913 and was headquartered in Chicago, IL.