Can SLPs diagnose autism? What the Illinois law actually says, and how to check your own state

If you saw the Illinois news pass through your feed this summer, you probably saw some version of "SLPs can now diagnose autism in Illinois."

That is not quite what happened, and the gap between the headline and the statute matters if you are trying to work out what you can actually do in your own practice. So here is the accurate version, followed by the part most clinicians actually need, which is how to figure out your own state.

Last updated: August 2026.

Key takeaways

• Illinois is the first state to explicitly authorize SLPs by statute to diagnose autism, but the authorization is narrow: children under 3, enrolled in Early Intervention, and only for SLPs trained in autism diagnostic evaluation.
• It does not take effect until January 1, 2028.
• Under ASHA's scope of practice, appropriately trained and experienced SLPs already have independent diagnostic authority for developmental disorders, subject to state law and payer rules.
• Those two constraints, not ASHA, are what stop most SLPs from diagnosing in practice.
• The bottleneck is real: Illinois families were waiting up to two years, and there are far more SLPs than there are physicians and psychologists authorized to evaluate.

What Illinois actually passed

House Bill 5225, now Public Act 104-561, was signed by Governor JB Pritzker on July 10, 2026, after passing the General Assembly unanimously.

Here is the scope, precisely:

• It applies to speech-language pathologists trained in autism diagnostic evaluation methods. Training can come from an approved program curriculum, worksite training, or continuing education.
• It applies only to children under age 3.
• Those children must be enrolled in the state's Early Intervention program.
• If the resulting plan of care includes anything outside the SLP's scope, the SLP must refer to appropriate medical personnel.
• It takes effect January 1, 2028, with implementation and rulemaking expected to take up to 18 months.

So this is not general diagnostic authority for SLPs in Illinois. It is a targeted intervention into one specific bottleneck: toddlers already in Early Intervention, already being seen by an SLP weekly, waiting a year or more for a diagnostic appointment that determines what services they can access.

That narrowness is a feature. It is also why the law passed unanimously.

The research that drove it

The statute came out of a four-year study led by Northwestern professor Megan Roberts, called Reduce the Wait.

The finding that moved legislators: autism diagnoses made by trained SLPs and those made by physicians agreed in 93% of cases.

That number is the whole argument. It reframes the question from "should SLPs be allowed to do this" to "is a two-year wait for a diagnostic appointment justified by the accuracy gained." When the clinician who already sees the child weekly can reach the same conclusion nine times out of ten, the wait is buying very little.

The nonprofit Start Early carried the advocacy. Rep. Natalie Manley sponsored the bill in the House, Sen. Meg Loughran Cappel in the Senate.

Wait, could we already do this?

This is the question that runs through every discussion of the Illinois news, and the answer surprises people.

ASHA's Autism Practice Portal states that ideally the SLP works as part of an interdisciplinary team with autism expertise. But it also says this directly:

When there is no appropriate team available, an SLP who has been trained in the clinical criteria for ASD and who is experienced in diagnosing developmental disorders may be qualified to diagnose these disorders as an independent professional.

So under ASHA's scope of practice, independent diagnostic authority is already there. It has been.

What stops it are two separate gates that have nothing to do with ASHA.

Gate one: your state licensure law

Your state's SLP practice act, and sometimes its medical practice act, governs what you may diagnose. Some states are permissive, many are silent, and silence is genuinely ambiguous. Illinois is now the only state that says yes explicitly, in statute, for a defined population.

Gate two: payer policy

This is the one that bites even where the law allows it. Medicare, Medicaid, and most commercial plans require a diagnosis from a physician or psychologist before they will authorize services on the basis of it. You can be fully within your scope and your state law, write a defensible diagnostic report, and still find that the family cannot use it to access what they need.

Both gates have to open. In most of the country, at least one is closed.

How to check your own state

There is no reliable published grid for this, and the ones circulating online are largely inference. Tennessee, for example, is widely cited as a state where SLPs already diagnose, but that appears to trace to secondary sources rather than to statute. Treat it as reported, not settled.

Here is how to actually find out:

1. Read your state's SLP licensure act, specifically the scope of practice section. Search it for "diagnose," "diagnosis," and "evaluate." Note whether diagnosis is listed, restricted, or simply not addressed.
2. Check your state board's guidance and advisory opinions. Boards often publish interpretive guidance that never makes it into the statute itself. This is where silence sometimes gets resolved.
3. Check whether a medical practice act constrains it. In some states, diagnosis of a medical or neurodevelopmental condition is reserved language regardless of what the SLP act says.
4. Call your top three payers. Ask specifically whether they will accept an autism diagnosis rendered by a licensed SLP for authorization purposes. Get the answer in writing if you can.
5. Ask your board directly if steps one through three leave you unsure. A written response from your licensing board is the only thing that will protect you if the question ever comes up.

If you go through that and your state turns out to be permissive, the next question is whether you are trained and experienced enough to do it well, which is a different question from whether you are allowed to.

The honest tension

Clinicians are split on this, and both positions are worth taking seriously.

The case for expanding it. Waits of one to two years are not a scheduling inconvenience. They are years in which a child does not have access to services that depend on the diagnosis, and years in which a family does not have the framework to understand their own child. The people best positioned to notice early differences are often the SLPs and OTs already in the home every week. The 93% agreement figure suggests the accuracy cost of moving faster is small.

The case for caution. Autism evaluation is differential work. The question is rarely "is this autism or is this typical development," it is "is this autism, a language disorder, a hearing difference, a global developmental difference, trauma, or several of these together." That differential requires training many SLPs do not have and grad school did not provide. Doing it badly harms families in both directions, and a diagnosis handed out casually is as damaging as one withheld for two years.

There is also a labor argument that surfaced in nearly every professional forum discussion of this: taking on high-stakes diagnostic responsibility without a corresponding change in compensation or protected evaluation time is not obviously a win for clinicians.

Illinois handled the first tension by writing training into the statute and limiting the population. That is a reasonable model. Whether the second tension gets addressed depends on how employers respond, and that is worth watching.

What this means if you work with young children

Whatever your state allows today, the direction is clear enough to prepare for.

If diagnostic work interests you, the training is worth pursuing now rather than after your state moves. Formal training in autism diagnostic tools, supervised experience across the differential, and a documented workflow are what turn permission into competence.

If it does not interest you, that is a legitimate choice. Not every SLP should be diagnosing, and the profession is not well served by treating it as the next rung on a ladder everyone should climb.

Either way, know which gates are open in your state. Clinicians get into trouble on scope questions far more often through assumption than through intent.

Why this matters beyond scope

It is easy to read this as a professional turf question. For the families waiting, it is not.

A diagnosis is not a verdict on a child. It is a key: to services, to school supports, to a community of other families, and to a way of understanding a child that fits rather than fights. Getting that key at 26 months instead of 44 months changes what a family's next two years look like.

That is what the Illinois law is actually about, and it is why the narrowness of it is worth reporting accurately rather than overselling.

Sources

• Northwestern Now: How a Northwestern study changed who can diagnose autism in Illinois
• Illinois General Assembly: HB5225 bill status, Public Act 104-561
• ASHA Practice Portal: Autism

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