Mark W, Li M.D.Attending PhysicianGastroenterology Internal Medicine Education: University of Illinois College of Medicine at ChicagoMain Office:626-960-0527 Optum Care 2440 S. Hacienda Blvd #105 Hacienda Heights, CA 91745 Certification: Board Certified in Gastroenterology, Internal Medicine Hospital Affiliations: PIH Health Hospital and Whittier Hospital Additional Office: 1433 W. Merced Ave Suite #102 West Covina, CA 91790