Lei Mary, Chen M.D.Attending PhysicianInternal Medicine Education: Shanghai, Fudan University Shanghai Medical CollegeMain Office:626-810-6777 Optum Care 18780 Amar Rd #107 Walnut, CA 91789 Clinic Intersts:internal medicine and primary care.Certification: Board Certified in Internal Medicine Additional Office: 923 S San Gabriel Blvd, San Gabriel, CA 91776 Additional Office: 8841 Garvey Ave, Rosemead, CA 91770