This brief examines rates of ED visits associated with ACSC diagnoses in the first few years of Healthy Kids (2005-06). Low rates of ED use for ACSC suggest that high use is not a major problem among program enrollees. The rate of ACSCs as a proportion of ED visits also did not decline over the study period, suggesting that while the Healthy Kids evaluation shows an impact upon perceived access to care and affiliation with a primary care provider, the expansion may not have a significant impact upon relatively rare events, such as pediatric hospital stays and ED visits.