Dr. Chien is a licensed Geriatric Medicine in CA. Graduated in 1990. Medical degree obtained from American University of Caribbean School of Medicine - Coupecoy. Completed residency training at John Hopkins Hospital. Currently practices at Oscar L Chien MD (Oscar L Chien MD), located at 1448 S San Gabriel Blvd, San Gabriel, CA 91776. Dr. Chien specializes in Internal medicine, family medicine and Geriatric Medicine.. In addition to English, Dr. Chien speaks Mandarin, Taiwanese, and Cantonese.