Cases involving mental disorders and their associated expenditures increased more than those of heart disease, cancer or any of the other top five costliest conditions, according to an Agency for Healthcare Research and Quality report.

The number of patients treated for mental disorders grew by 14 million between 2002 and 2012, while expenditures for mental disorders grew by $25 million. Additionally, the percentage of out-of-pocket expenses was highest for the treatment of mental disorders in both 2002 and 2012.