To identify medical problems most commonly presenting to emergency departments among individuals with autism as compared to non-autistic persons across age groups. Data was obtained from the 2010 National Emergency Department database and was analyzed by age categories: 3–5, 6–11, 12–15, 16–18 and 19 years and older. Epilepsy emerged as the leading presenting diagnosis among those with Autism spectrum disorder (ASD), ages 16–19 years and 19 over. Psychiatric conditions were primary among ASD individuals aged 12–15 years, accounting for more than 11 % of all visits. In this sample, age-related differences were noted in medical diagnoses among autistic individuals as compared to non-autistic persons.