Dr. Mary L Chen specializes in emergency medicine in Walnut area. Dr. Mary L Chen, MD has a medical practice at 18780 Amar Road, Suite 107, Walnut CA, and has over 32 years of experience in the field of medicine. She graduated from her medical school with her medical degree in 1985. Dr. Chen is accepting new patients at her medical office and practice location in Walnut, California. She is available for appointments, preventative care, medical care as well as ongoing patient care.