In 6 of the 17 states covered here the answer is no, and you can employ the diagnostician inside an ordinary entity. In 9 it flips ownership, so diagnosis belongs in a separate licensee-owned entity paired with a management company. In 2 it depends on whether you use a psychologist or a physician. The classification tracks each state's treatment of psychology and medicine, not its ABA verdict, which is why an open ABA state can still close the moment you internalize the diagnostician.
- The setup: diagnosis is the gate
- The diagnostician paradox
- The one question that decides it
- Who can diagnose
- The lever: psychologist versus physician
- The structure that keeps both your ownership and your compliance
- Where this goes wrong
- The 17-state readout
- How this connects to the rest of the guide
- Common questions
- Where professional advice is essential
The setup: diagnosis is the gate
ABA is a treatment, not a diagnosis. Before a practice can bill ABA as medically necessary, someone has to diagnose the autism spectrum disorder, and a behavior analyst cannot. A BCBA runs the functional assessment and writes the treatment plan, but the DSM-5 diagnosis that unlocks reimbursement comes from a licensed physician, a developmental-behavioral pediatrician, child psychiatrist, or pediatric neurologist, and often a general pediatrician, or from a licensed psychologist. That diagnosis is the gate to every dollar of ABA revenue, which creates a problem most operators walk into without seeing it.
The diagnostician paradox
Owners want the diagnostician close, for a real reason. If a separate diagnosis company refers Medicaid-funded patients to a commonly owned ABA company, that referral relationship is a remuneration-for-referral problem under the federal Anti-Kickback Statute. The obvious fix is to bring the diagnostician in-house as an employee of the same entity, which removes the cross-entity referral and fits the bona fide employment safe harbor.
But the diagnostician is a physician or a psychologist. In most states those professions are reached by the corporate-practice-of-medicine doctrine and the professional-entity statutes, while ABA usually is not. The moment your entity renders psychology or medicine, it can be forced into licensee ownership, which the ABA-only entity had escaped. So the move that solves your kickback exposure can trigger the ownership restriction you were clear of. That is the diagnostician paradox, and it is why hiring a diagnostician is a structuring decision, not an HR decision.
The classification tracks how the state treats psychology and medicine, not how it treats ABA. Sixteen of the seventeen states here are ABA-open, yet only six let you bring the diagnostician in-house.
The one question that decides it
For any state, the analysis collapses to a single question: does the state force psychology or medicine into a licensee-owned entity? The answer sorts every state into one of four situations.
Clean
The state repealed, abolished, or never had a corporate-practice doctrine, or a profession-wide statute lets ordinary entities render professional services. Employ the diagnostician inside an ordinary entity and ownership stays open.
Flip
An active corporate-practice or learned-professions doctrine, or an enumerated list naming psychology, forces the diagnostician's profession into a licensee-owned entity. Internalizing the diagnostician defeats open ownership.
Nuanced
The state reaches medicine but not psychology, or the reverse. A psychologist can go in-house while a pediatrician cannot. The diagnostician you choose decides the answer.
Split
The state bars a single entity from rendering two professions, so even a licensee-owned combined entity is not permitted. The diagnosis has to sit in its own professional entity regardless.
Notice what is not in that question: the ABA verdict. Whether ABA is open, amber, or a mandate in your state tells you nothing here, because the diagnostician classification tracks how the state treats psychology and medicine, which is a different statute and often a different answer.
Who can diagnose
The near-universal answer is a licensed physician or a licensed psychologist. Two sources set the exact list in your state, and both should be checked. The first is scope of practice: the state psychology practice act and medical practice act, plus any advanced-practice-nurse, neuropsychology, or counseling scope that reaches diagnosis. The second is the payer overlay: the state Medicaid ABA or autism benefit provider manual and the state commercial autism-insurance mandate define the qualified diagnosing or ordering provider, and some states widen the list to physician assistants, certified registered nurse practitioners, licensed clinical social workers, or certified school psychologists. Whichever way the list runs, the two entries that matter for ownership are always the same two: the psychologist and the physician.
The lever: psychologist versus physician
Medicine is the most corporate-practice-restricted profession in nearly every state. Psychology is frequently lighter, and sometimes decisively so. That makes the choice of diagnostician a structuring lever, not a clinical afterthought.
- A pediatrician, being a physician, triggers the strongest flip. Where a state reaches medicine, a physician diagnostician pulls the entity into the hardest version of the ownership rule.
- A psychologist is often the safer path, and sometimes the whole difference. Oregon's SB 951, the strictest new corporate-practice law in the country, reaches medicine and nursing but not psychology, so a psychologist-based diagnostic structure can sit outside its worst restrictions. In Wisconsin and Maryland, a psychologist can be employed in an ordinary entity while a physician cannot.
This is also what the scaled operators do. The platforms that internalize diagnosis staff it with licensed psychologists, not developmental pediatricians, for three reasons that all point the same way: the comprehensive ASD evaluation is core psychologist work, psychologists are cheaper and far more available to hire than the scarce and backlogged developmental-pediatrics workforce, and the psychologist carries the lighter corporate-practice footprint. The physician diagnosis pathway is dominated by health systems and academic centers, from which families bring an outside diagnosis to the ABA provider. Unless a payer or a specific case demands a medical diagnosis, the default is the psychologist.
The structure that keeps both your ownership and your compliance
The model that resolves the paradox is the same one used to invest in regulated healthcare generally. Think of it as a property manager: one management company runs several practices and owns none of their clinical work. The governing principle is that no single entity ever combines a restricted service with a non-licensee owner. Three entities do the work.
- The MSO, investor-ownedHolds everything non-clinical: leases and build-out, equipment, IT, the billing and revenue-cycle operation, HR, scheduling, intake, marketing, the brand, and the capital. It employs the non-clinical workforce. An ordinary LLC or corporation, so anyone can own it.
- The ABA clinical entity, treatmentHolds the BCBAs and delivers and bills ABA. In an open state this can be non-licensee owned.
- The diagnostic professional entity, licensee-ownedWhere the state requires it, a separate entity owned by a licensed psychologist or physician that holds the diagnosing clinicians and bills the diagnosis. Because psychology and medicine are restricted in flip states, this entity has to be licensee owned. It cannot be the investor.
The agreements tie the entities together without mixing them. Each clinical entity signs a management services agreement with the MSO. The MSO provides all non-clinical services, the clinical entities keep full authority over clinical decisions, and in return each clinical entity pays the MSO a fair-market-value management fee, which is where the investor's economics live. Payers reimburse each clinical entity for its own service, the diagnostic entity for the diagnosis and the ABA entity for the therapy. Critically, no money moves between the diagnostic entity and the ABA entity for the referral: the psychologist diagnoses, the family goes to the ABA entity for treatment, and nothing is paid for that hand-off.
Management fees, not referral payments
- A fair-market-value fee, set in advance, for services actually rendered
- Not tied to the volume or value of referrals (42 CFR 1001.952(d))
- The diagnosis-to-treatment referral carries no payment at all
- Each entity bills and is paid for its own service
- A percentage-of-clinical-revenue fee that reads as a disguised profit strip
- Payment flowing for the diagnosis-to-treatment referral
- An MSO that can remove the clinician at will and takes all the economics
- A restricted service and a lay owner sharing one entity
This defuses both problems at once. Ownership does not flip, because no single entity mixes a restricted service with a lay owner: the diagnostic entity is licensee owned, the ABA entity stays open, and the MSO is investor owned. The Anti-Kickback Statute is managed, because the cash flows are management fees for services actually rendered rather than payments for referrals, which fits the personal-services and management-contract safe harbor as long as each fee is set in advance at fair market value and is not tied to the volume or value of referrals. And you still get the coordinated, one-intake experience you wanted, because the MSO runs scheduling and intake for both practices as an administrative service.
Where this goes wrong
This is precisely the structure regulators are now watching, so three things separate a durable arrangement from a cautionary tale. The fee has to be genuine fair-market-value compensation for real services, because a percentage-of-clinical-revenue fee starts to read as fee-splitting or a disguised profit strip, which is what voids these arrangements. The licensed owners must hold real clinical authority, because if the MSO can remove the clinician at will and takes all the economics, a court can treat the licensee-owned entity as a sham, and that is the fact pattern that has sunk friendly-professional-corporation structures. And the model itself is under active tightening: Oregon's SB 951 and California's 2025 moves target the friendly-professional-corporation and MSO structure directly, limiting ownership overlap and stock-transfer-restriction agreements, so Oregon is currently the one state where even the standard fix is under attack. Assume more states follow.
One more reason the psychologist is the default: if the diagnostician is a physician and the payer is Medicaid, the federal physician self-referral rules add a layer that a psychologist diagnostician does not trigger.
The 17-state readout
Across the seventeen states mapped here the pattern is stable, and it confirms the framework: the classification tracks each state's treatment of psychology and medicine, never its ABA verdict. Sixteen of the seventeen are ABA-open, yet only six are clean. The table below shows each state's classification, what it means for bringing the diagnostician in-house, and the provision that decides it.
| State | Classification | What it means | What decides it |
|---|---|---|---|
| Ohio | Clean | Employ the diagnostician in an ordinary entity | Corporate-practice doctrine abolished; ordinary entities may render professional services (ORC 4731.226) |
| Missouri | Clean | Employ the diagnostician in an ordinary entity | Never adopted the doctrine; an any-owner LLC may employ physicians and psychologists |
| Arizona | Clean | Employ the diagnostician in an ordinary entity | A 2022 statute lets any health professional be employed by any business entity (A.R.S. 32-3230) |
| Virginia | Clean | Employ the diagnostician in an ordinary entity | An ordinary corporation may render the profession through the licensee (§ 54.1-111(F), 13.1-542.1(3)) |
| Georgia | Clean | Employ the diagnostician in an ordinary entity | Corporate-practice statute repealed in 1982 and never enforced; LLCs may employ professionals |
| Utah | Clean | Employ the diagnostician in an ordinary entity | No strict doctrine; a physician may be employed by a business corporation (§ 58-67-802) |
| Pennsylvania | Flip | Diagnosis in a separate licensee-owned entity plus an MSO | Psychology and medicine are restricted professional services (15 Pa.C.S. §§ 8995 to 8998) |
| Texas | Flip | Diagnosis in a separate licensee-owned entity plus an MSO | Active doctrine; a professional entity must be owned by licensees in the service (BOC ch. 301) |
| North Carolina | Flip, trends split | Diagnosis cannot share the ABA entity; it sits separately | Strict doctrine; psychology must be a Chapter 55B licensee-owned entity (§ 55B-2(2)) |
| Oregon | Flip, hardest | Separate diagnostic entity; the MSO fix is itself under attack | 1947 doctrine plus SB 951/HB 3410 (2025) limiting MSO ownership overlap |
| Illinois | Flip | Diagnosis in a psychologist-owned entity | Clinical psychology must be psychologist-owned (805 ILCS 185/, 805 ILCS 10/); ABA already licensee-owned |
| Michigan | Flip, trends split | Diagnosis in a separate licensee-owned entity | Learned-professions doctrine; a psychology entity must be same-licensure owned (MCL 450.1284) |
| Tennessee | Flip | Diagnosis in a separate licensee-owned entity plus an MSO | Learned-professions doctrine; entity membership restricted to licensees (48-249-1109) |
| Colorado | Flip | Diagnosis in a separate licensee-owned entity plus an MSO | Strict doctrine; psychology corporation requires licensed-psychologist control (12-245-213) |
| District of Columbia | Flip | Diagnosis in a separate licensee-owned entity plus an MSO | Same-license ownership required for professional entities (DC Code § 29-508) |
| Wisconsin | Nuanced | A psychologist in-house works; a physician flips it | Doctrine bars employing physicians; its reach to psychology in an LLC is unsettled |
| Maryland | Nuanced | A psychologist in an ordinary LLC works; a physician flips it | Medicine doctrine applies, but the LLC Act permits professional-service LLCs |
The per-state detail, with the governing statute quoted for each, lives in the state pages beneath this hub.
How this connects to the rest of the guide
The diagnostician question sits at the intersection of four pillars, which is why no single existing page answers it. Whether your ABA entity is open in the first place is the entity decision, and this analysis reuses that verdict as its starting point. How the diagnostic entity and the management company are owned and priced is the MSO and ownership question, and the friendly-professional-corporation structure here is the same one that pillar covers. Who counts as a qualified diagnosing provider is set by Medicaid and insurance rules and the commercial mandate, and the licenses the whole analysis turns on are the subject of licensing and credentialing. The diagnostician question is where those four meet.
Common questions
Can a BCBA diagnose autism?
Why not just hire the diagnostician into my ABA company?
Does using a psychologist instead of a pediatrician change the answer?
If I keep diagnosis in a separate company, is that not a kickback risk?
My state is open for ABA. Does that mean the diagnostician is fine in-house?
Where professional advice is essential, not optional
The framework above tells you which of the four situations your state is in and which structure fits. It does not tell you where your fair-market-value fee lands, whether your management services agreement clears the safe harbor as written, or how to paper the clinical-control terms so the diagnostic entity is not a sham. Those are the questions that decide whether the structure holds, they are specific to your facts and your footprint, and they are worth doing once, correctly.
Here is what we do about that. We are not attorneys, we do not give legal advice, and we do not sell legal documents. What we do is the research and translation layer that makes the legal engagement faster and cheaper: we map this framework onto your state and your diagnosis pathway, pull the corporate-practice and safe-harbor provisions that apply to your facts, and hand you and your counsel a brief that starts the engagement at the finish line instead of at billable hour one.
The classifications here summarize corporate-practice doctrines, professional-entity statutes, and anti-kickback safe harbors that are amended and reinterpreted, and Oregon, California, Colorado, and the District of Columbia are particularly active. The official code of each state, the applicable federal safe harbor, and qualified healthcare-regulatory and tax counsel are the authoritative sources. Nothing here should be relied on in place of direct verification and professional advice.