The diagnosis of autism by state agencies.

The authors mailed a short survey to every U.S. state. They asked two simple questions. What rules does your education department use to label a child autistic? What rules does your mental-health agency use?

All 50 states answered. The team stacked the answers side by side to see how much they matched.

The rules did not match. Some states wanted a doctor’s note. Others wanted a school team vote. A few listed test scores. Many gave no written steps at all.

In short, a child called autistic in one state might not earn the same label next door.

Jones et al. (2010) later showed the fallout: autism labels in special-education tripled in the next decade. When rules are loose, numbers can balloon.

Bao et al. (2017) found the opposite after DSM-5 tightened criteria. Caseloads flattened. Stricter rules slowed new diagnoses.

van Timmeren et al. (2016) updated the map for money, not labels. Only ten states run autism-specific Medicaid waivers today. Provider shortages remain the top hurdle.

Together the papers trace a loop: loose state rules (1988) → label surge (2010) → tighter DSM-5 (2017) → still patchy funding (2016).

Before you refer a child, open your state’s education and Medicaid websites. Print the autism criteria. Check if they match your assessment tool. If they clash, call the district first. A five-minute check can save months of paperwork and prevent a denied service.