Tennessee is one of a small number of states with federally standardized autism prevalence data — and the numbers tell a more specific story than the generic statistics that circulate online. This article covers what the CDC's most current surveillance data actually shows for Tennessee, what it means for how autism is being identified in the state, and what families need to know about accessing ABA therapy and early intervention.
Tennessee's place in the national surveillance network
In 2022, a total of 16 sites across the United States conducted surveillance for ASD among children aged 4 and 8 years as part of the CDC's Autism and Developmental Disabilities Monitoring (ADDM) Network. Tennessee was one of those sites, covering 11 counties in Middle Tennessee.
The ADDM Network reviews clinical and educational records directly — not surveys or self-reports. That makes it one of the most methodologically rigorous autism surveillance programmes in the world and means Tennessee's figures come from the same evidence base as the national 1-in-31 headline.
Vanderbilt University Medical Center is the research institution behind the Tennessee ADDM site — the same institution that runs TRIAD, Tennessee's primary clinical and research resource for autism.
The headline figures
Among children aged 8 years in 2022, ASD prevalence at the Tennessee site was 34.0 per 1,000 children — approximately 1 in 29. A total of 889 children with ASD were identified out of a surveillance population of 26,182.
Tennessee's 34.0 per 1,000 sits slightly above the national ADDM average of 32.2 per 1,000. It is not the highest in the network — ASD prevalence across the 16 sites ranged from 9.7 per 1,000 in Texas (Laredo) to 53.1 per 1,000 in California — but it suggests that Middle Tennessee's identification infrastructure is functioning at or above the national average.
Who is being identified in Tennessee
By sex
In Tennessee's ADDM site, ASD prevalence among boys was 51.6 per 1,000 and among girls was 15.3 per 1,000, a male-to-female ratio of 3.4 to 1 — matching the national ratio exactly.
By race and ethnicity
In Tennessee, ASD prevalence among Asian or Pacific Islander children was 51.0 per 1,000 — the highest of any racial or ethnic group at the Tennessee site. Black children had a prevalence of 38.5 per 1,000, Hispanic children 41.1 per 1,000, and White children 29.4 per 1,000.
Tennessee was one of five sites where lower neighborhood median household income was associated with higher ASD prevalence — a pattern that suggests identification disparities persist across socioeconomic lines even as overall identification improves.
By age
The median age of earliest documented ASD diagnosis at the Tennessee site was 49.5 months — slightly above the national median of 47 months. Among children with co-occurring intellectual disability, the median age of diagnosis was 38 months; among those without intellectual disability, it was 50 months.
That gap — 38 months versus 50 months — reveals something important. Children with more visible developmental differences are being caught earlier. Children with subtler presentations, particularly girls and children without intellectual disability, are being identified later. That delay matters because access to early intervention services like ABA therapy depends on diagnosis timing.
Early identification: Tennessee is ahead of the national curve
One of the most striking findings from the Tennessee 2022 ADDM data concerns younger children. Among children aged 4 years, Tennessee's ASD prevalence was 36.3 per 1,000 — higher than among 8-year-olds at the same site. Tennessee was one of only five sites nationally where 4-year-old prevalence exceeded 8-year-old prevalence — meaning Tennessee is identifying more children before school age than after, which is the clinical goal.
Overall, cumulative incidence of ASD diagnosis or eligibility by age 48 months was 1.7 times as high among children born in 2018 compared with those born in 2014. Tennessee's younger cohort is being caught earlier than the generation before it.
An important limitation
The Tennessee ADDM site covers 11 counties in Middle Tennessee — primarily the Nashville metropolitan area. Vanderbilt Kennedy Center's clinical presence anchors this surveillance infrastructure. Prevalence and identification patterns in East Tennessee (Knoxville, Chattanooga) or West Tennessee (Memphis) are not captured by this data and may differ meaningfully from what is reported here.
What this means for Tennessee families
Tennessee's early identification picture is improving. More children are being identified before age 4 than in previous cohorts, which should translate into earlier access to ABA therapy during the developmental window when research shows it is most effective.
Tennessee's Early Intervention System (TEIS) provides services at no cost for children from birth through age two with developmental delays. Referrals can be made by parents, physicians, or other caregivers. TennCare, Tennessee's Medicaid programme, covers ABA therapy for children with an autism diagnosis. Tennessee's private insurance landscape for ABA varies by plan — Tennessee does not have a standalone private insurance ABA mandate equivalent to Georgia's Ava's Law, so families with private insurance should verify their specific plan's coverage before starting services.
Blossom ABA provides in-home ABA therapy across Tennessee — no waitlist, TennCare accepted. Services are available across Nashville, Memphis, Knoxville, Chattanooga, Murfreesboro, Franklin, Clarksville, Brentwood, Spring Hill, Johnson City, Kingsport, and many other Tennessee communities.
Contact our team to get started — no referral needed.
Tennessee autism resources
How Tennessee compares to other states Blossom serves
Tennessee's data comes directly from CDC surveillance — which puts it in a different category from most states when it comes to what the prevalence figures actually mean. Here's how the other states in Blossom's service area compare, and what data sources they're working from.
Autism Statistics in Georgia → — Georgia has been an ADDM site since 2000. Its Metro Atlanta prevalence of 32.6 per 1,000 sits just below Tennessee's 34.0 figure.
Autism Statistics in North Carolina → — NC is not an ADDM site. The available data comes from state special education enrollment, and the methodology is different from what Tennessee's figures are based on.
Autism Statistics in Virginia → — Virginia is also not an ADDM site. Here's what families in Virginia can and can't know from existing data — and how the state's ABA insurance mandate works.
Blossom provides in-home ABA therapy across Tennessee, Georgia, North Carolina, and Virginia — TennCare accepted, no waitlist. Talk to our team about getting started.
Frequently Asked Questions
What is the autism prevalence rate in Tennessee?
The CDC's 2022 ADDM data for 11 counties in Middle Tennessee shows 34.0 per 1,000 children aged 8 — approximately 1 in 29. This is slightly above the national average of 32.2 per 1,000. The surveillance area covers Middle Tennessee; prevalence in other regions of the state may differ.
Does TennCare cover ABA therapy?
Yes. TennCare covers ABA therapy for children with an autism diagnosis. Tennessee does not have a blanket private insurance ABA mandate, so families with private insurance should verify their specific plan's coverage before starting services.
At what age are Tennessee children typically diagnosed with autism?
The 2022 CDC ADDM data shows a median of 49.5 months at the Tennessee site. Children with co-occurring intellectual disability were identified at a median of 38 months; those without intellectual disability at 50 months. Tennessee is one of only five ADDM sites nationally where ASD identification rates among 4-year-olds exceeded those of 8-year-olds — indicating meaningful progress in early identification.
Is Blossom ABA available outside Middle Tennessee?
Yes. While the ADDM data covers Middle Tennessee, Blossom provides in-home ABA therapy across the full state — including Knoxville, Chattanooga, Memphis, and East Tennessee communities.
Sources
Shaw KA, Williams S, Patrick ME, et al. Prevalence and Early Identification of Autism Spectrum Disorder Among Children Aged 4 and 8 Years — Autism and Developmental Disabilities Monitoring Network, 16 Sites, United States, 2022. MMWR Surveill Summ 2025;74(No. SS-2):1–22. https://www.cdc.gov/mmwr/volumes/74/ss/ss7402a1.htm
CDC. Data and Statistics on Autism Spectrum Disorder. https://www.cdc.gov/autism/data-research/index.html
