Providing Professional Liability Insurance Exclusively to Anesthesia Practices Preferred Physicians Medical Risk Retention Group, a Mutual Insurance Company (PPM) is the only company of its kind in America — an anesthesia focused medical professional liability insurance provider. Established in 1987, PPM pioneered the concept of a specialty-specific insurance company. PPM is owned entirely by its policyholder/members. In 2017, PPM entered a new strategic partnership with NORCAL Mutual (NORCAL). NORCAL serves as PPM’s exclusive reinsurance provider. In addition, PPM’s former holding company, PPM Services, Inc., was acquired by NORCAL and through this process will provide PPM with additional administrative, management and insurance resources. PPM is national in scope, registered to insure anesthesia practices in all 50 states & District of Columbia.