We examined the association between state Medicaid spending for children with disabilities and the financial burden reported by families of children with autism. Child and family data were from the 2005-2006 National Survey of Children with Special Health Care Needs (n = 2,011 insured children with autism). State characteristics were from public sources. The 4 outcomes included any out-of-pocket health care expenditures during the past year, expenditure amount, expenditures as a proportion of family income, and whether additional income was needed to care for a child. We modeled the association between state per capita Medicaid spending for children with disabilities and families' financial burden, controlling for child, family, and state characteristics. Overall, 78% of families raising children with autism had health care expenditures for their child for the prior 12 months; 42% reported expenditures over $500, with 34% spending over 3% of their income. Families living in states with higher per capita Medicaid spending for children with disabilities were significantly less likely to report financial burden. There is a robust relationship between state Medicaid spending for children with disabilities and the financial burdens incurred by families raising children with autism.