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Why State Prevalence Rates Don’t Tell the Whole Story (And What to Look at Instead)
Most practice owners Google “autism prevalence rates by state,” see California or New Jersey at the top, and start planning their move. Then they can’t get clients in the door.
CDC prevalence data doesn’t measure what you think it measures. Those numbers show where kids are getting diagnosed, not where families need services. High prevalence rates usually mean strong screening infrastructure—pediatricians who know what to look for, schools that identify kids early. Great for public health. For your practice? You’re walking into a market where ten other ABA companies got there five years ago.
I’ve watched practices chase the “highest prevalence” strategy and compete against established providers who already have relationships with every pediatrician and school district in town. Meanwhile, practices in medium-prevalence states with the right indicators fill their waitlists in months.
Prevalence data is one layer, not the whole picture. You need three data points working together.
Layer one: Prevalence data — Yes, look at CDC numbers and IDEA Part B data. Use them to eliminate obviously weak markets (extremely low diagnosis rates might signal lack of awareness or insurance coverage), not to pick your winner.
Layer two: Waitlist indicators — This is where real opportunity lives. Call five practices in your target area. Ask how long their waitlist is. If everyone says “we’re not taking new clients” or “six to nine month wait,” you’ve found unmet demand. If they say “we can start next week,” that’s a different story. The waitlist research takes two hours and tells you more than any prevalence chart.
Layer three: Insurance landscape — Most markets will work if you market well. Just stay away from ones with extremely volatile insurance. Check which major payers operate in the state, what their ABA coverage looks like, and whether Medicaid reimburses at reasonable rates. A high-prevalence state with terrible insurance is a trap.
The markets that work best aren’t the ones with the highest CDC numbers. They’re the ones where diagnosis rates are climbing (check year-over-year IDEA Part B data), existing providers have long waitlists, and insurance infrastructure supports ABA services. That might be a suburb in a medium-prevalence state where families are moving in and no one’s opened a practice in three years.
Before you write off a market because the prevalence rate looks low, check the waitlist situation. Before you jump into a high-prevalence market, count how many competitors are already there and ask whether you can realistically build referral relationships faster than they did.
Do this today: Pick three markets you’re considering. For each one, find the CDC prevalence rate, call three practices to ask about their waitlists, and look up which insurance plans cover ABA. Write down all three data points side by side. The right market will show moderate-to-high prevalence, consistent waitlists, and stable insurance—not just the highest number on the CDC chart.
If you’re in Texas or Florida or any of the other 39 states, you’re guessing.
Where to Find Autism Diagnosis Rates by Location (The 4 Data Sources That Matter)
Most ABA practice owners assume the CDC has current autism diagnosis rates by location for their state. They don’t. The numbers you find on the CDC website are typically 8 years old and only cover 11 states.
CDC ADDM Network: The Gold Standard (That’s Always Late)
The CDC’s Autism and Developmental Disabilities Monitoring Network is the most rigorous prevalence study we have. They review medical and education records for 8-year-olds in participating communities. The methodology is solid, but the coverage is terrible for market planning.
The most recent published data is from 2020, analyzing kids born in 2012. By the time you read it, those kids are 12. And it only covers 11 states — Arizona, Arkansas, California, Georgia, Maryland, Minnesota, Missouri, New Jersey, Tennessee, Utah, and Wisconsin. If you’re in Texas or Florida or any of the other 39 states, you’re guessing.
The ADDM data gives you true prevalence estimates (how many kids actually have autism), not just how many are getting services. That distinction matters when you’re trying to understand total addressable market versus current service penetration.
IDEA Part B Child Count: Actual Numbers, Updated Annually
This is the data source most practice owners should start with. Every state reports how many children ages 3-21 are receiving special education services under the autism category. The Department of Education publishes this annually, and it covers all 50 states.
You can pull these numbers directly from the IDEA Data Center website. Search for “IDEA Part B Child Count by Disability Category.” The data is typically 12-18 months old, which is way better than the CDC’s 8-year lag. When you’re analyzing IDEA Part B data for ABA expansion, you’re looking at kids already in the system.
These are kids already in the school system receiving services. It misses kids under 3 (who are in Part C early intervention), kids in private schools, and kids with autism who aren’t classified under the autism category for their IEP. Some kids get services under “speech/language impairment” or “other health impairment” even though they have an autism diagnosis.
State Health Department Reports: Hit or Miss
Some states publish their own autism prevalence studies or service utilization reports. These vary wildly in quality and recency. California publishes quarterly reports through the Department of Developmental Services showing how many people are receiving regional center services. New York has similar data. Most other states don’t.
Check your state health department website and search for “autism prevalence” or “developmental disabilities data.” If they have something, it’s usually buried in a PDF report.
Pull the IDEA Part B data for your state this week. Look at the trend over the past five years. That tells you more about actual demand than any CDC report.
Building Your Expansion Scorecard: Weighting Prevalence Against Other Factors
Most practice owners pick their next state by gut feel. Someone knows a BCBA in Texas, or they heard Florida has “high demand,” so they jump. Then six months in, they realize insurance reimburses $12 less per hour than their home state and the market’s saturated with competitors.
The Expansion Scorecard
Build a simple spreadsheet. List 5-10 target states down the left column. Across the top, create these five categories with their weights:
Insurance landscape (30%) — What do commercial payers reimburse per hour? How fast do they pay? Are there any Medicaid carve-outs that make billing a nightmare? This matters more than anything else because it directly impacts your revenue per client.
Competition intensity (25%) — How many ABA providers per 10,000 kids under 18? Check state licensing boards and run searches on Psychology Today or your local equivalent. If you see 40+ practices in a metro area, you’re fighting for scraps.
Operational costs (20%) — Office rent, staff salaries (BCBAs, RBTs), malpractice insurance. A BCBA in California costs $95K base. In North Carolina? $72K. That $23K difference per clinician adds up fast.
Prevalence data (15-20%) — Yes, the thing this whole post is about. But notice where it sits. Prevalence tells you the potential pool size, not whether you can actually build a profitable practice there.
Talent availability (10%) — Can you hire BCBAs and RBTs without relocating your entire team? Check university programs nearby, local job boards, how many BCBAs are already working in the area.
Score each category 1-10 for each state. Multiply by the weight. Add them up.
Why Prevalence Can’t Drive the Decision
Most people see California has 1 in 22 kids diagnosed with autism and think, “That’s my goldmine.” Then they discover commercial insurance pays $45/hour (versus $65 in their home state), there are 200+ ABA practices in LA County alone, and office space costs double.
All the data you can look at is important — insurance rates, population, talent availability — but really most markets will work if you market well. Just stay away from ones where there’s extremely volatile insurance.
Prevalence above 20% weight in your scorecard means you’re chasing volume without considering whether you can actually serve those families profitably. A state with mid-tier prevalence and solid insurance reimbursement will outperform a high-prevalence state with terrible fundamentals every time.
The North Carolina Decision
One practice I worked with scored eight states. California topped prevalence (obviously). But when they ran the full scorecard:
California scored 6.2/10 overall. High prevalence (9/10) couldn’t overcome insurance challenges (4/10), intense competition (3/10), and operational costs (5/10).
North Carolina scored 7.8/10. Mid-tier prevalence (6/10), but strong insurance landscape (8/10), manageable competition (7/10), reasonable costs (8/10), and three university programs pumping out BCBAs (8/10).
They opened in Raleigh. Eighteen months later, they’re at 65 active clients with a 12-week waitlist. If they’d gone to California, they’d still be fighting to break even.
State-by-State Operational Realities
You can find a state where autism prevalence is 30% higher than your current market, but if the operational realities don’t line up, you’ll make less money serving more kids.
Licensure portability — Some states accept your BACB certification and let you start supervising cases immediately. Others require you to apply for state licensure, which can take 4-6 months and costs $500-2,000 per BCBA. If you’re planning to expand with three BCBAs, that’s $6,000 in licensing fees before you bill a single hour.
Medicaid rates vary by 300% — At least 50% of your clients will be Medicaid. Virginia’s Medicaid reimburses well enough that having a 50% Medicaid payor mix doesn’t sink your margins. Other states reimburse $45/hour for direct therapy while your cost to deliver is $52/hour after you factor in drive time, cancellations, and benefits.
Supervision ratios change your staffing model — Some states allow one BCBA to supervise 15-20 RBTs. Others cap it at 10. If you’re expanding into a state with a 1:10 ratio and you plan to serve 60 clients, you need six BCBAs instead of three. That’s $450,000 in additional annual salary expense.
Open a spreadsheet. List your top 5 expansion states. Score just the insurance landscape category first — call three practices in each state and ask what commercial payers reimburse per hour. If you can’t get within $5-10 of your current rate, cross that state off before you waste time on the rest of the scorecard.
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