Dr. Chang-Witt is a licensed Internal Medicine in CA. Medical degree obtained from Northwestern University School of Medicine. Completed residency training at University of Wisconsin. Currently practices at Kaiser Permanente (Kaiser Permanente), located at 2500 Merced St, San Leandro, CA 94577. Dr. Chang-Witt specializes in internal medicine, primary care.. In addition to English, Dr. Chang-Witt speaks Mandarin.