Public healthCDC ADDM Network1994–2022

Autism used to be found in white children first. Then the lines crossed.

The CDC has tracked autism diagnosis rates by race since the early 2000s. For most of that history, white 8-year-olds were identified more often than Black, Hispanic, or Asian American children. Sometime around 2014, that started to change — and it hasn't changed back.

By Kalaivani Chandramohan · August 14, 2026

Autism diagnosis rate per 1,000 8-year-olds, by race/ethnicity, from CDC's ADDM Network reports. Solid segments are reported data points; the dashed segment interpolates between the 2002 and 2018 reports — the two years CDC itself flags as before/after the shift. Spacing between years is even, not proportional to elapsed time, so each period stays readable.

1994–2000s

The old pattern

When ADDM first tracked 8-year-olds born in 1994, white children were diagnosed with autism at nearly double the rate of Hispanic children — and nobody thought that meant autism was rarer in Hispanic or Black communities.

Researchers pointed instead to the diagnosis pipeline: fewer specialists in underserved areas, less insurance coverage, later referrals, and doctors more likely to hand a Black child a diagnosis of conduct disorder before anyone considered autism. In one study of Medicaid-eligible children in Philadelphia born in the 1990s, Black children with autism were identified, on average, a year and a half later than white children with the same condition — most of a toddler's early-intervention window, gone before the diagnosis even arrived.

6.7White, per 1,000
5.9Black, per 1,000
3.9Hispanic, per 1,000
Children born in 1994, diagnosed by age 8 (2002 ADDM report). Asian/Pacific Islander wasn't yet tracked as its own category.

2014–2018

The catch-up

Then, gradually, the gap narrowed — not because autism became less common in white children, but because it became easier to find in everyone else.

By CDC's own account, Black children reached the same identification rate as white children around 2014. Asian and Pacific Islander children caught up two years later. By 2018, Hispanic children had too — for the first time since ADDM began, no racial or ethnic group was being diagnosed more than any other.

It wasn't only about how many got diagnosed — it was also about how soon. The gap in diagnosis age between Black and white children closed steadily across three separate studies:

1.6 yrsPhiladelphia, children born 1993–99
7 moThe Bronx, children born 2003–10
2 moADDM, children born 2008
Average delay in autism diagnosis for Black children compared with white children, across three cohort studies spanning roughly two decades.

2020–2022

The flip

By 2020, parity had turned into reversal. Black, Hispanic, and Asian/Pacific Islander children were all being diagnosed at higher rates than white children — and CDC's 2022 survey confirmed the pattern had held.

The gap isn't small anymore. Asian and Pacific Islander children are now diagnosed at 38 per 1,000; white children, at 28.

Autism diagnosis rate per 1,000 8-year-olds, 2020 vs. 2022 ADDM reports.

Mechanism

What actually changed

Nobody thinks the biology of autism shifted by race in a decade. What shifted was who got looked at, and how easily families could get an evaluation covered.

  1. 01

    Universal toddler screening (2007)

    The American Academy of Pediatrics told pediatricians to screen every child for autism at 18 and 24 months — not just the children whose parents already suspected something. That catches kids whose families didn't know to ask.

  2. 02

    State insurance mandates (2001–2020)

    Every state eventually required private insurers to cover autism evaluation and treatment, closing a gap that had put diagnosis out of reach for many working families.

  3. 03

    The Affordable Care Act (2010)

    It barred insurers from denying coverage for pre-existing conditions, including autism, and drove Medicaid expansion that grew the number of providers qualified to diagnose and treat it.

A fair counterpoint

Not every researcher reads this purely as a gap closing. In one national survey, 58% of behavioral pediatricians said their colleagues at least sometimes over-diagnose autism — meaning some of the newer growth in minority communities may reflect looser application of the diagnosis, not only better access for kids who'd been missed.

The remaining gap

What still hasn't caught up

The count evened out. The severity of what gets found didn't.

Among 8-year-olds diagnosed with autism in 2020, Black children were far more likely to also have a co-occurring intellectual disability than white or Hispanic children with autism — a gap that has shown up in every ADDM report for years.

Share of 8-year-olds with autism who also have a co-occurring intellectual disability (IQ below 70), 2020 ADDM report. Dashed line marks the overall average across all groups.

One likely explanation: access has improved most for the most visible cases. A child with a significant intellectual disability is hard to miss. A child with milder autism, doing fine in a mainstream classroom, is still more likely to slip through if they're Black — the same kind of gap that used to keep the overall numbers low in the first place. It didn't disappear. It moved to a different layer of the data.

The lines crossing is real progress — it means kids who would have been missed a decade ago are getting identified now. But a gap that changes shape instead of closing is still a gap. Inequity in autism diagnosis didn't end in 2020. It moved: from whether a child gets found at all, to how severe a child has to be before someone looks.