Dr. Diana Mercado is a pediatrician practicing in Jacksonville, FL. Dr. Mercado is a doctor who specializes in the health care of children. As a pedicatrician, Dr. Mercado diagnoses and treats infections, injuries, diseases and other disorders in children. Pediatricians typically work with infants, children, teenagers and young adults up to age 21. They practice medical care as well as preventative health care. Dr. Mercado can oversee and manage the physical, mental and emotional health of their patients.