Dr. James S Ma specializes in gastroenterology in Riverside area. Dr. James S Ma, MD has a medical practice at 10800 Magnolia Ave, Riverside CA, and has over 27 years of experience in the field of medicine. He graduated from Medical College Of Virginia Commonwealth University School Of Medicine with his medical degree in 1990. He is affiliated with numerous hospitals, including Kaiser Foundation Hospital, Riverside (CA) and more. Dr. Ma is accepting new patients at his medical office and practice location in Riverside, California. He is available for appointments, preventative care, medical care as well as ongoing patient care.