With a network spanning more than 5,000 square miles and thousands of health care providers, Regal Medical Group is part of o ... ne of Southern California's largest managed health networks. That size works to your advantage, allowing us to be there to coordinate all of your health care, when and where you need us. In spite of our size, we remain rooted in close community and operate upon the simple, traditional principles of knowing our customer, and providing respectful, personal, quality care. Regal is a part of the Heritage Provider Network (HPN) , a limited Knox-Keene licensed organization in California that provides affordable quality care to its members. Through innovative programs and services designed specifically for the managed care environment, HPN and its medical groups have been successful in delivering the goals it set out to achieve while establishing long-standing, favorable provider relationships. read more