This Statistical Brief presents estimates based on the Household Component of the Medical Expenditure Panel Survey (MEPS-HC) on the use of and expenditures related to mental health disorders among adults ages 18 to 64 in the U.S. civilian noninstitutionalized population. Average annual estimates for 2009-2011 are shown by source of payment. Expenditures for pooled years are expressed in constant dollars by inflating those for 2009-10 to 2011 U.S. dollars using the Personal Health Care Expenditure (PHCE) price index component of the National Health Expenditure Accounts (