This brief presents data on mental health coverage benefits and enrollees' access to and use of mental health services through the Healthy Kids program in San Mateo County, California. The prevalence of mental health conditions among enrollees is similar to national levels, but despite the generous mental health benefits offered under the program, only a small fraction of enrollees with mental health conditions receive care. Reasons why more children do not use mental health services are explored. The brief also shows that enrollees with mental health needs have higher use of other health services compared to all Healthy Kids members.