Two studies from Thomson Reuters and the Substance Abuse and Mental Health Services Administration found that a law allowing extra coverage for workplace-based mental health and substance abuse healthcare coverage won't have a significant effect on expenses.

The two studies noted that substance abuse spending was minimal, as it only accounted for 0.4 percent of total expenses in 2009. In addition, mental health spending, when combined with substance abuse expenses, only totaled 5.2 percent of all costs from 2001 to 2009.

"Employers need not be alarmed by the new coverage mandates of the MHPAEA," said Dr. Tami Mark, the paper's lead author and senior director for Thomson Reuters. "It seems clear, given the relatively low spending on, and low intensity of use of, mental health and substance abuse services, that the additional cost incurred by employers because of the mandate is likely to be negligible."

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