The John Muir Medical Group is a board certified family practice. Dr. Michael S. Varon became a member in 1997 and Dr. Tanya Threewitt came on board in 2002. Both take part in the John Muir Medical Network. The medical practice has its very own medical lab, Muir Lab, next door. For those who wish to contact the doctors after hours, a hotline of John Muir Health is available and will gladly connect patients to doctors on call.