Thirteen states reported that in fiscal year 2012 they paid a total of about $5.6 billion to limited benefit plans to provide mental health services to about 4.4 million adult Medicaid beneficiaries. States can enroll different populations–such as adults who are blind, disabled, or have developmental disabilities–in limited benefit plans, which could contribute to the variation in the number of adults enrolled and level of capitated payments made across the 13 states.