Dr. Ian B Diaz specializes in family practice in San Marcos area. Dr. Ian B Diaz, MD has a medical practice at 150 Valpreda Road, San Marcos CA, and has over 24 years of experience in the field of medicine. He graduated from his medical school with his medical degree in 1993. He is affiliated with numerous hospitals, including Tri-city Medical Center (CA) and more. Dr. Diaz is accepting new patients at his medical office and practice location in San Marcos, California. He is available for appointments, preventative care, medical care as well as ongoing patient care.