Dr. Jan Herrman is a Nephrologist and General Physician in Fontana 923…read more35, Fontana CA and has an experience of 41 years in these fields. Dr. Jan Herrman practices at Kaiser Foundation Hospital in Fontana 92335, Fontana CA,Southern California Permanente Medical Group in Ontario 91761, Ontario CA and Fresenius Kidney Care Rancho Cucamonga in Rancho Cucamonga 91730, Rancho Cucamonga CA.read less