Dr. Maria Mejia-o'neill specializes in physical therapy in Vista area. Dr. Maria Mejia-o'neill has a medical practice at 1932 Hacienda Drive, Vista CA, and has over 39 years of experience in the field of medicine. She graduated from University Of Southern California School Of Medicine with her medical degree in 1978. Dr. Mejia-o'neill is accepting new patients at her medical office and practice location in Vista, California. She is available for appointments, preventative care, medical care as well as ongoing patient care.