Dr. Lyu is a licensed Internal Medicine in IL. Medical degree obtained from National Yang-Ming University School of Medicine, Taiwan. Completed residency training at MercyHealth. Currently practices at MercyHealth (MercyHealth), located at 415-A Congress Parkway, Crystal Lake, IL 60014. Dr. Lyu specializes in internal medicine, primary care.. In addition to English, Dr. Lyu speaks Taiwanese and Mandarin.