Objective Did mental health cost‐sharing decrease following implementation of the Mental Health Parity and Addiction Equity Act (MHPAEA)? Data Source Specialty mental health copayments, coinsurance, and deductibles, 2008–2013, were obtained from benefits databases for “carve‐in” plans from a national commercial managed behavioral health organization. Study Design Bivariate and regression‐adjusted analyses compare the probability of use and (conditional) level of cost‐sharing pre‐ and postparity. An interaction term is added to compare differential levels of pre‐ and postparity cost‐sharing changes for plans that were and were not already at parity pre‐MHPAEA. Findings Controlling for employer/plan characteristics, MHPAEA is associated with higher intermediate care copayments ($15.9) but lower outpatient ($2.6) copayments among in‐network‐only plans. Among plans with in‐ and out‐of‐network benefits, MHPAEA is associated with lower inpatient ($23.2) and outpatient ($2.5) copayments, but increases in inpatient and intermediate in‐network and out‐of‐network coinsurance (about 1 percentage point). Among the few plans not at parity pre‐MHPAEA, changes in use and level of cost‐sharing associated with MHPAEA were more dramatic. Conclusion Mixed evidence that MHPAEA led to more generous mental health benefits may stem from the finding that many plans were already at parity pre‐MHPAEA. Future policy focus in mental health may shift to slowing growth in cost‐sharing for all health services.