Dr. Koo is a licensed Gastroenterology in CA. Graduated in 2012. Medical degree obtained from Penn State Health Milton S. Hershey Medical Center. Completed residency training at UH Cleveland and fellowship training at UC Davis Medical Center. Currently practices at St. Jude Heritage Medical Group (St. Jude Heritage Medical Group), located at 1837 Sunny Crest Dr, Fullerton, CA 92835. In addition to English, Dr. Koo speaks Mandarin and accepts new patients.