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The Los Angeles Healthy Kids program was created in 2003 to provide medical insurance to uninsured children ages 0–5 years in families with household income below 300 percent of the federal poverty level (FPL) who are ineligible for SCHIP or Medicaid. The frequency of emergency department (ED) visits due to ambulatory care sensitive conditions (ACSC) is often used to gauge health care access within insurance expansions or organizational changes within health care systems. These are health conditions that usually can be managed successfully outside of hospitals with high quality primary care. Specifically, ACSCs refer to medical conditions (such as asthma and dehydration) for which appropriate ambulatory care is expected to reduce the risk of hospitalization or emergency department use. This brief shows the rates of ED visits associated with ACSC diagnoses in the first few years of the Los Angeles County Healthy Kids program (2005–06). Based on claims data, the low rates of ED use for ACSC suggest that high use is not a major problem in the population of children enrolled in Healthy Kids. The rate of ACSCs as a proportion of ED visits also did not decline over the two years observed. This suggests that while the Healthy Kids evaluation show