Despite the availability of numerous antiepileptic drugs, some epilepsies remain resistant to treatment. We compared utilization and costs in patients with uncontrolled epilepsy to those with stable epilepsy using commercial insurance claims data. We found patients with uncontrolled epilepsy use more services and incur higher costs compared with those with stable epilepsy. Epilepsy-related costs accounted for <50% of the total costs, suggesting that comorbid conditions and/or under identification of utilization may substantially contribute to costs. This study was published in Epilepsy & Behavior and can be read here.