★★★★★5.0(1)Dr. Daniel Null, MDInternistSan Francisco, CAAccepting patientsAffiliated with a Castle Connolly Top HospitalAccepting patientsAffiliated with a Castle Connolly Top Hospital(415) 353-7300(415) 353-7300Ratings & ReviewsMost RecentHighest Rated07/13/2017Best MDOne the best doctor I have known, very caring. When we lost our coverage we have lost one the best.1