This is a Treatment Episode Data Set (TEDS) annual report that presents national-level data from the Treatment Episode Data Set (TEDS) for admissions in 2013 and trend data from 2003 to 2013. It provides information on the demographic and substance abuse characteristics of admissions aged 12 and older to treatment for abuse of alcohol and/or drugs in facilities that report to individual state administrative data systems. TEDS received treatment admission records from 49 states, the District of Columbia, and Puerto Rico. Pennsylvania had submitted no data for 2013 by January 23, 2015, and is excluded from this report.