He attended the University of Minnesota Medical School and then went on to complete his residency at a hospital affiliated with the University of Minnesota. His areas of expertise include tonsilitis, sinusitis (sinus infection), and endoscopic sinus surgery. Dr. Preciado is rated 4.5 stars out of 5 by his patients. He takes Medicaid and Medicare insurance. Dr. Preciado is conversant in Spanish. He is affiliated with Children's National Health System.