Adolescents living in single-mother households are more likely to have behavioral health conditions, but are less likely to utilize any behavioral health services. Using nationally representative mother-child pair data pooled over 6 years from the National Survey on Drug Use and Health, the study finds that when single mothers were uninsured, their adolescent children were less likely to utilize any behavioral health services, even when the children themselves were covered by insurance. The extension of health coverage under the Affordable Care Act (ACA) to uninsured single mothers could improve the behavioral health of the adolescent population.