Most ABA practice owners can name their biggest payer without thinking. Ask what percentage of their revenue depends on that payer, though, and the answer gets fuzzier: somewhere between “a lot” and “I’d have to check.”
That lack of visibility can be expensive.
If one insurer accounts for a small share of your revenue, a rate cut or policy change may be manageable.
If it accounts for half, the impact can reshape your entire practice. You can’t control when a payer cuts rates, tightens authorization requirements, or changes its contract.
You can control how much of your business is exposed to any one payer.
Flychain works with ABA practices across the country and sees firsthand how payer mix can shape a practice’s financial health.
Drawing on data from Flychain’s ABA therapy provider network, this article explores three important questions:
- How much payer concentration is too much?
- What happens financially when a major payer changes its rates or terms?
- How much does payer mix really matter when different insurers can reimburse very different amounts for the exact same service?
When one payer controls the market, no provider can push back
In March 2026, CareSource notified Georgia ABA providers by certified letter that it was cutting reimbursement 20% across the board, effective in roughly six weeks. Providers had 45 days to object.
There was no actuarial filing and no public process. Breaking News ABA covered the mechanics of how that became possible in the article: When No ABA Provider Could Push Back, CareSource Slashed Rates 20%.
The part worth sitting with is why it worked. CareSource was the only care management organization in the market with a renewed contract. Two exiting plans were winding down. Three incoming plans could not yet credential anyone or pay a claim.
Providers had no alternative payer to move volume toward. Peach State proposed the same 20% cut and paused after pushback. CareSource didn’t have to pause, because there was nowhere for anyone to go.
Inside that story is a concentration story. One Savannah pediatric therapy owner told local press she would have to discharge all 89 of her CareSource patients. CareSource was roughly a third of her caseload.
For illustration, a practice with CareSource representing 8% of revenue would face a very different financial problem than one with 33%. Same rate cut, very different exposure. In this case, the outcome was decided entirely by a number that was set months or years earlier, mostly by accident.
Concentration does not cause rate cuts. It determines whether you can absorb one.
How many payers does the typical ABA practice bill?
In an analysis of 173 ABA practices using Flychain, the typical practice billed six different payers over the 12 months ending July 2026.
Six payers may sound diversified. But payer count and payer diversification are not the same thing.
A practice can bill six different payers while still depending heavily on one or two for the majority of its revenue.
A payer representing 5% of collections poses a very different financial risk than one representing 50%; even though both count as “one payer.”
That’s why simply counting contracts can create a false sense of diversification.
What matters financially isn’t just how many payers you bill, but how much of your collected revenue comes from each one.
The Flychain data also shows just how varied ABA payer relationships can be.
Across those 173 practices, the books contained 499 distinct payers, ranging from national commercial insurers to state Medicaid programs, school districts, and regional behavioral-health authorities. In fact, 17 practices in the dataset billed no commercial insurer at all.
So when an ABA owner says, “We’re diversified. We’re contracted with six payers,” there’s a second question that matters much more:
What percentage of your revenue comes from the biggest one?
That’s the number that tells you whether six payers really means six sources of revenue; or whether your practice is still financially dependent on one or two.
The threshold to watch for: no single payer above 40% of revenue
Why 40%?
The 40% threshold is an operating guideline Flychain uses with its clients, not an empirical cutoff for practice viability. But the logic behind it is straightforward.
Many independent ABA therapy practices operate on relatively thin margins, and much of an ABA practice’s cost base can’t adjust quickly:
- BCBA compensation is shaped by a competitive labor market
- Staffing and supervision requirements constrain how quickly labor costs can change
- Expenses like rent, billing, and administrative infrastructure don’t disappear when reimbursement falls.
Consider the math. If a payer represents 40% of practice revenue and cuts reimbursement by 20%, that translates to an 8% reduction in total revenue. For a practice operating on an 8–15% margin, a single payer decision could erase most (or potentially all) of its annual operating margin.
At 60% payer concentration, the same rate cut produces a 12% decline in total revenue. Absorbing a hit of that size may require significant cost reductions, potentially including changes that affect clinical capacity and, in turn, revenue.
That’s the practical rationale behind the 40% guideline: once a single payer approaches 40% of revenue, an adverse but plausible change in reimbursement can put a substantial portion of the practice’s financial margin at risk.
What concentration actually costs when it breaks
Payer concentration risk isn’t limited to rate cuts. A major payer can tighten authorization requirements, change medical-necessity criteria, terminate a contract, or simply experience an administrative disruption that delays payment.
Mini-case: the 2025 TRICARE contractor transitions
On January 1, 2025, TRICARE began operating under a new generation of regional contracts, with TriWest Healthcare Alliance replacing Health Net Federal Services in the West.
The new contracts produced significant administrative disruption. In the West, providers and beneficiaries encountered referral and authorization problems; in the East, provider-record and claims-processing issues contributed to delayed and unpaid claims.
By May 2025, roughly 16,000 providers in the East Region were reportedly affected by payment issues, with some owed more than $100,000.
For ABA providers, there was an added complication. Disruptions in the West became significant enough that the Defense Health Agency temporarily waived referral-approval requirements for many outpatient specialty services. ABA and Autism Care Demonstration services were explicitly excluded from that waiver.
The lesson for ABA owners isn’t about TRICARE specifically. It’s about what happens when too much revenue depends on a system you don’t control.
If TRICARE represents 15% of your revenue and payments are significantly delayed, you have a serious receivables problem, but one the rest of the business may be able to absorb. At 55%, the same disruption can become a payroll and liquidity problem.
Nothing about your clinical operation changed. Your reimbursement rate didn’t change. But your financial exposure did.
Concentration is only half the risk: Payers don’t pay the same rate
Two practices can have identical payer concentration and very different economics. Why? Because the same service can be worth significantly more (or less) depending on the payer.
Flychain analyzed negotiated commercial rates published in Transparency in Coverage data for ABA providers across the Washington, DC metro area.
For 97153 – one of the highest-volume codes for many ABA practices – the median negotiated rate per 15-minute unit was:
- $10.00 with Cigna
- $15.00 with Aetna
- $13.82 with Optum / UnitedHealthcare (at the HM/RBT tier)
- $15.66 with Optum / UnitedHealthcare (at the HN bachelor-level tier)
That’s a difference of more than $5 per 15-minute unit, or more than $20 per hour of direct therapy, depending simply on the payer. Across thousands of 97153 units over the course of a year, that difference adds up quickly.
These figures are specific to commercial rates in the DC metro – not Medicaid rates or national benchmarks – and individual contracts vary.
The important takeaway isn’t the specific dollar amount. It’s that meaningful reimbursement differences can exist between payers for the exact same service.
That changes how practice owners should think about payer concentration.
If a large share of your volume sits with one of the lowest-paying payers in your market, you have two problems: you’re highly concentrated, and you’re concentrated in a relatively low-paying contract.
But there’s an important distinction when using rate data. Comparing rates across payers can help you decide which networks may be more attractive to pursue.
When negotiating with an existing payer, however, the more useful benchmark is what that same payer pays other comparable providers in your market. If another local ABA practice has negotiated a higher rate with the same payer, you have evidence that a higher reimbursement tier exists.
And reimbursement rate alone doesn’t determine the value of a payer relationship. Authorization requirements, denials, payment delays, and administrative burden all affect what a practice ultimately collects.
The goal isn’t simply to diversify across more payers. It’s to build a payer mix that balances concentration risk, reimbursement, and the operational reality of getting paid.
For anyone who wants to see how a market-level rate comparison is structured, Flychain’s DC ABA rate cheat sheet lays out the format on a single page.
Why most practices can’t see their own payer mix
There’s a practical reason many owners struggle to answer a seemingly simple question: What percentage of my revenue comes from each payer?
Traditional bookkeeping often records revenue when money hits the bank, without consistently attributing each payment back to the underlying payer. A deposit may simply be categorized as “Insurance Revenue,” while the payer-level detail lives upstream in the practice’s billing or remittance data. As a result, the P&L can tell you how much revenue the practice generated, but not necessarily where it came from.
Practice management and billing systems can help fill the gap, but there’s another important distinction: billed revenue is not the same as collected revenue.
A payer may look significant based on claims submitted, but tell a very different story once denials, payment delays, authorization limits, and actual collections are taken into account.
For payer concentration, what ultimately matters is how much money you actually collect from each payer.
That visibility needs to be built into the practice’s financial reporting. Whether through the accounting system, billing data, or a combination of both, owners should be able to answer one basic question every month: What percentage of my collected revenue came from my largest payer?
Building a payer mix strategy: Diversify by quality, not just count
The goal isn’t to add payers for the sake of adding payers. A stronger payer mix reduces concentration while improving the practice’s overall economics and resilience.
Here’s a practical approach:
1. Measure your current concentration. Start with the last 12 months of collected revenue by payer. What percentage came from your largest payer? Your top three?
2. Understand the economics of each payer. Don’t look at contracted rates alone. Consider what you actually collect, how quickly you get paid, denial rates, authorization requirements, and the administrative effort required to manage the relationship.
3. Benchmark before you credential. Compare reimbursement for your highest-volume CPT codes across payers in your market before deciding which networks to pursue.
- Flychain conducts this type of contracted rate analysis for its customers, benchmarking their rates against other providers in their local market to identify both negotiation opportunities and potentially stronger payer relationships.
4. Diversify strategically. The best new payer isn’t simply another logo on your payer list. Ideally, it has meaningful membership in your service area and attractive reimbursement for the services you deliver most frequently. That allows you to reduce concentration while potentially improving your blended reimbursement rate.
5. Renegotiate existing contracts. Where market data shows that the same payer reimburses comparable local providers at higher rates, use those benchmarks to support your negotiation.
6. Revisit your payer mix regularly. Concentration can change without an intentional decision as referrals, client volume, and authorization patterns shift. Review it at least quarterly.
And there’s a reason to do this before concentration becomes a problem.
Adding a new payer relationship can take months. By the time a major payer cuts rates, changes its policies, or terminates a contract, there may not be enough time to meaningfully diversify.
Payer concentration is easiest to fix while it still looks like a theoretical risk. Not after it becomes a cash-flow problem.
The number to know before the letter arrives
Georgia providers didn’t run into trouble simply because CareSource cut rates by 20%.
The bigger issue was how much of their business depended on that one payer and how little time they had to build an alternative once the change was announced.
That brings us back to the question at the beginning of this article: If your largest payer cut your rates by 20% tomorrow, what would happen to your practice?
The answer starts with one number: What percentage of your revenue comes from that payer?
If you can answer that immediately, you have the visibility to start managing the risk.
If you can’t, that’s the first problem to solve.
Before payer mix becomes a credentialing strategy, a contracting strategy, or a negotiation strategy, it has to be something you can actually see and measure.
Payer concentration is a number worth knowing while everything is going well. Not one you want to calculate for the first time after a certified letter arrives.
