Epilepsy is a significant comorbid condition in institutionalized persons w
ith developmental disabilities and may contribute significant additional co
sts. This study was conducted to provide an estimate of the costs of epilep
sy from the institutional perspective. Costs were measured retrospectively
for 50 persons with epilepsy and 50 persons without epilepsy matched by sev
erity of developmental disability. A time and motion study was employed to
assign opportunity costs to documented nursing and physician activities. Tw
o separate methods of attribution were used and incremental costs attributa
ble to epilepsy were found to be approximately $825 and $918 per person ove
r a 6-month period. The following categories accounted for costs: personnel
(47.0%), drug (39.6%), hospitalization (9.4%), and laboratories/procedures
(4.0%). Results are useful for describing the economic burden of epilepsy.