While young adults health is recognized as a public health issue in France, little attention is given to their health care access. The purpose of this article is to examine the existence of inequality of opportunity in access to care for young adults and the relative contribution of circumstances and efforts to this inequality based on the data from the National Survey on Youth Resources (2014). Using concentration indices, we show inequalities in access to care related to parents' income. Linear probability models show the association of parental circumstances (diploma, marital status) and efforts (education, occupation, living with parents) with the probabilities of non-use of care and unmet care need. This reflects inequalities of opportunity as well as fair inequalities. The variance decomposition shows that the contribution of efforts is more important than those of circumstances, however this result is sensitive to the normative approach considered and to the type of indicators used.