Epidemiology of Alzheimer Disease and Related Dementia Among Medicare and Medicaid Enrolled Autistic Adults, 2011-2019.

The dementia and autism diagnoses came from billed claims codes, not from clinical tests, imaging, or record review. There was no comparison group of adults without autism or intellectual and developmental disabilities, so the study cannot show that autism itself raises dementia risk. Only adults with Medicaid or Medicare claims for autism were included, so autistic adults without those claims and privately insured autistic adults are not represented. More frequent healthcare contact in Medicaid and Medicare enrollees may increase the chance that dementia is recorded. The rise in prevalence over time may reflect better identification, longer survival, or changing risk rather than a true increase in dementia. Sex was recorded only as male or female, and ethnicity options were limited, so gender and cultural differences may be missed. The study reported counts by dementia type, but did not test clinical outcomes or treatment effects.

The article lists NIH extramural research support. No additional funding or conflict-of-interest declaration is given in the supplied text.

Do not conclude that autism causes dementia or that this proves a higher risk than the general population. The study used billed claims, had no non-autistic comparison group, and cannot separate diagnosis from healthcare contact.