Medically reviewed by Dr. Erica R. Crawford, PsyD
If you’ve started researching autism, you’ve probably run into a confusing mix of terms — Asperger’s, PDD-NOS, “classic” autism, high-functioning, low-functioning, levels 1 through 3. Some are current, some are outdated, and some were never quite right to begin with. This guide sorts them out so you can understand where your child fits and, more importantly, what kind of support they actually need.
What Are the Different Types of Autism?
Today, there is officially only one diagnosis — autism spectrum disorder (ASD) — and clinicians describe it using three support levels (Level 1, 2, and 3) rather than separate types. Older terms you may still hear, such as Asperger’s syndrome, PDD-NOS, and childhood disintegrative disorder, were folded into this single diagnosis in 2013. Understanding both the current framework and the legacy labels helps you make sense of paperwork, school records, and conversations with older family members or providers.
Why Did the “Types” of Autism Change?
The types changed because research showed the old categories weren’t reliable — two clinicians could give the same child different labels, and the labels didn’t predict what help a child needed. In 2013, the DSM-5 combined the previously separate diagnoses into one umbrella diagnosis of autism spectrum disorder, and the current DSM-5-TR (text revision, 2022) keeps that single-diagnosis structure. Instead of naming a “type,” clinicians now specify a severity level and note details like language ability and co-occurring conditions.
Here’s the scale of why getting this right matters: the CDC now estimates that about 1 in 31 children in the United States is identified with autism spectrum disorder — a spectrum so broad that a single label was never going to capture it. That’s exactly why the field moved to a dimensional, support-based model.
How Does the Autism Spectrum Actually Work?
“Spectrum” doesn’t mean a straight line from “mild” to “severe.” It means autism shows up as a unique combination of traits — social communication, sensory sensitivities, repetitive behaviors, special interests, language — that vary independently in each person. A child can need very little support in one area and a great deal in another.
One helpful way to picture it: imagine a mixing board rather than a single dial. Each trait has its own slider set to its own level. Two autistic children might share the same “sliders” but at completely different settings — which is why no two autistic kids look quite alike, even within the same family.
The Three Levels of Autism (DSM-5-TR)
The current framework describes how much support a person needs across two domains: social communication and restricted/repetitive behaviors. Levels can differ between the two domains and can change over time and across settings.
| Level | Support needed | What it can look like |
|---|---|---|
| Level 1 | “Requiring support” | Speaks in full sentences but struggles with back-and-forth conversation and social cues; difficulty with transitions and organization. Often what people informally call “high-functioning autism.” |
| Level 2 | “Requiring substantial support” | Marked difficulties with verbal and nonverbal communication even with support; more visible repetitive behaviors; distress with change. |
| Level 3 | “Requiring very substantial support” | Severe communication challenges (may be minimally verbal or nonverbal); significant difficulty with change; needs daily hands-on support. |
If your child’s profile sounds like Level 1, our detailed guide on high-functioning autism explains what that term does and doesn’t mean and how it maps onto Level 1 support.
What Happened to Asperger’s Syndrome?
Asperger’s syndrome is no longer a separate diagnosis. Since 2013 it has been included within autism spectrum disorder, and people who would previously have received an Asperger’s diagnosis are now generally diagnosed with ASD Level 1. Individuals in this group are typically verbal and may have strong language and cognitive skills, while still finding social cues, nonverbal communication, and change genuinely challenging.
The Older Labels You Might Still Hear
These terms appear in older records, in casual conversation, and internationally, so it helps to recognize them — even though clinicians in the U.S. no longer diagnose them separately.
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Asperger’s Syndrome
Once used for autistic people with strong language and cognitive skills and lower support needs. Now diagnosed as ASD Level 1.
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PDD-NOS (Pervasive Developmental Disorder – Not Otherwise Specified)
A “catch-all” for children who showed clear autistic traits but didn’t fully meet the criteria for autistic disorder or Asperger’s. These children are now diagnosed under the single ASD umbrella.
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Childhood Disintegrative Disorder (CDD)
Described rare cases where a child developed typically for at least two years, then lost previously acquired skills. It, too, was folded into ASD in 2013. Any loss of skills at any age should always be evaluated promptly.
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Rett Syndrome
Once grouped with autism, Rett syndrome is now understood to be a distinct genetic condition caused by mutations in the MECP2 gene and is not part of the autism spectrum. It has its own diagnostic and treatment path.
Does the Label Even Matter Anymore?
What matters most is not the label but the support plan attached to it. A modern diagnosis of “ASD, Level 2, with accompanying language impairment” tells a school, therapist, and family far more about what a child needs than an old category name ever did. The goal of the diagnostic shift was practical: describe the person accurately enough that the right help follows.
That said, having language for your child’s experience can be genuinely comforting and useful for advocacy. Use whichever terms help you communicate — just know that a current evaluation will describe your child in terms of support levels and specific strengths and challenges.
How Do You Get an Accurate Diagnosis?
Because the categories are dimensional and individualized, an accurate diagnosis requires a comprehensive evaluation — developmental history, direct observation, standardized tools, and input from caregivers and often teachers. A single questionnaire or classroom impression isn’t enough to determine a level or a support plan.
Wondering whether to pursue an evaluation at all? Start by taking our free screening questionnaire to organize your observations. If it points toward next steps, you can schedule a virtual evaluation — available nationwide, so you’re not held up by local waitlists.
