Dr. Kitajima is a licensed Internal Medicine in CA. Graduated in 1997. Medical degree obtained from UCLA School of Medicine. Completed residency training at Harbor-UCLA Medical Center. Currently practices at Optum Care (Optum Care), located at 2699 Atlantic Ave, Long Beach, CA 90806. Dr. Kitajima specializes in internal medicine, primary care.. In addition to English, Dr. Kitajima speaks Mandarin and accepts new patients.