CONCLUSIONS AND RELEVANCE: In this cohort study of Medicaid-enrolled adults, autistic adults experienced high rates of co-occurring ADHD and were more likely to receive ADHD medication prescriptions than adults in the general population. Negative health outcome rates are higher among autistic people with co-occurring ADHD, although ADHD medication prescriptions are associated with lower rates of negative health outcomes. Treating ADHD may improve health among autistic adults.
