List of Preferred Provider Networks The following is a list of active Preferred Provider Networks approved by the Medical Advisory Board. Beacon Mutual Insurance Company (for its insured) Brown University City of Providence, Inc. Diocesan Service Corporation Hasbro, Inc. International Packaging Corporation Lifespan Corporation and Affiliates Markel Service, Inc. Rhode Island Interlocal Risk Management Trust Rhode Island Nursing Home Group Rhode Island, State of (for state employees) Taco, Inc.