Mark W. Niedfeldt, M.D., LLC - Main Location Mark W. Niedfeldt, M.D., LLC Address 10556 N Port Washington Rd, Ste. 101 Mequon, WI 53092 US 43.210082, -87.923470 Contact Information 262-643-4720 Location Map View on Google Maps Back to Mark W. Niedfeldt, M.D., LLC