Mary McDonald Md, Sc is located at 2700 W 9th Ave., Oshkosh, WI. This business specializes in Gastroenterology. Mary McDonald Md, Sc is open Mon, 9am-5pm; Tue, 9am-4pm; Wed, 9am-5pm; Thu, 9am-4:30pm; Fri, 9am-4pm; Sat, Closed; Sun, Closed and accepts Cash, Mastercard, Personal Checks and Visa.