Muir/Diablo Primary Care (MDPC) Medical Group Primary Care Physicians (PCPs) is the exclusive provider of primary care services at John Muir Outpatient Center, Tice Valley/Rossmoor. A panel of five internists and a nurse practitioner are available at John Muir. MDPC is a 100-physician medical group, whose practices are owned and operated by the John Muir/Mt. Diablo Health Network, as part of an integrated physician-hospital system. MDPC physicians have access to all of the latest advances of John Muir's Information Technology including the ability to have real-time laboratory and radiology results on their PDAs and office computers.