The prevalence of autism among Medicaid beneficiaries ages 18 to 64 rose by 46% between 2008 and 2012. In 2008, the prevalence of autism was 2.8 per 1,000 adult Medicaid beneficiaries with 12-month annual enrollment. Between 2008 and 2012, the prevalence rate rose steadily each year, and reached 4.1 per 1,000 adult continuously eligible beneficiaries in 2012. In total, of the 46 million continuously enrolled Medicaid beneficiaries in 2012, 78,261 (0.17%) were receiving services for autism. During this period, the prevalence rate among younger beneficiaries ages 18 to 24 rose more steeply than . . .
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