Internal medicine
Internal medicine physicians, or internists, train three additional years after medical school leading to board certification in internal medicine. Pediatricians train three additional years after medical school to board-certify in pediatrics. Med-peds physicians train for four years and can be "double-boarded" for both these specialties. Since there is frequent crossover of disease and treatment between children and adults, med-peds training consolidates these two specialties into four years. The performance of med-peds physicians on the two national board exams is equal to their one-specialty (specific internist or pediatrician) counterparts.