What Are the Types of Autism Spectrum Disorders?
If you’ve ever tried to look up “types of autism” online, you’ve probably noticed something confusing pretty fast. Some articles talk about Asperger’s. Others mention PDD-NOS. Some skip straight to “Level 1, 2, 3” like you’re already supposed to know what that means. It can feel like everyone’s using a slightly different language, and you’re the only one who didn’t get the memo.
Here’s the good news: none of this is actually as complicated as it looks. In this article, we’re going to break it all down together, in plain, everyday language. No confusing medical jargon. No charts you need a dictionary to understand. Just a clear, honest explanation of what these terms actually mean, where they came from, and how autism is classified today, so you can walk away actually understanding it instead of more confused than when you started.
Quick Answer: Are There Still Different "Types" of Autism?
Here’s the short version: not anymore, officially.
Back before 2013, doctors used to split autism into several separate diagnoses. But researchers realized these categories often overlapped so much that they weren’t very useful in practice. Two doctors might label the exact same child differently depending on which clinic they visited. So, in 2013, all of these separate labels were merged into one single diagnosis: Autism Spectrum Disorder (ASD).
Today, instead of “types,” professionals talk about levels of support — Level 1, Level 2, and Level 3 which describe how much help a person needs day-to-day, rather than putting them into a fixed category.
But here’s the thing: even though these older terms aren’t used for new diagnoses anymore, they haven’t disappeared. You’ll still hear them in conversations, older medical records, school reports, books, and even from people who were diagnosed years ago and still identify with the term they grew up with. So understanding them is still genuinely useful.
Let’s go through each one.
The Historical Types of Autism, Explained Simply
Asperger's Syndrome
Think of Asperger’s as sitting on the milder, more subtle end of the autism spectrum. People with this diagnosis usually didn’t have any noticeable delay in learning to talk in fact, many were highly articulate, and some were exceptionally intelligent in specific areas.
What set them apart was how they connected with other people. Someone with Asperger’s might:
- Talk in a very formal or unusually detailed way for their age
- Become completely absorbed in one topic — dinosaurs, trains, space, computers, you name it — and want to talk about it constantly
- Struggle to pick up on things like sarcasm, body language, or “reading the room”
- Prefer routines and predictability over surprises
- Find small talk exhausting or pointless, while deep, focused conversations feel natural
A lot of adults today who grew up before 2013 were diagnosed with Asperger’s, and many of them still proudly use the term to describe themselves — sometimes calling themselves “Aspies” even though it’s technically been folded into the broader autism diagnosis.
Pervasive Developmental Disorder – Not Otherwise Specified (PDD-NOS)
This one has a mouthful of a name, and honestly, it was always meant to be a bit of a “catch-all” category. Doctors used PDD-NOS when a child clearly showed autism-like traits, trouble with communication, repetitive behaviors, restricted interests but didn’t check every single box needed for a full autistic disorder or Asperger’s diagnosis.
You can think of it as sitting right in the middle of the spectrum: more pronounced than Asperger’s, but not as intense as classic autistic disorder. Kids diagnosed with PDD-NOS often had a real mixed bag of strengths and struggles, which made this one of the trickiest labels for parents to fully understand.
Autistic Disorder (Sometimes Called "Classic Autism")
This term described the more textbook, intense presentation of autism the kind most people picture when they hear the word “autism.” It involved the same core traits as the categories above (communication struggles, repetitive behaviors, restricted interests), but at a more pronounced level, usually meaning more day-to-day support was needed.
Children with this diagnosis often had noticeable delays in speech development, more repetitive behaviors like hand-flapping or rocking, and more difficulty adapting to unfamiliar situations.
Childhood Disintegrative Disorder (CDD)
This is the rarest and honestly, the most heartbreaking of the older categories. Children with CDD developed completely normally for the first couple of years of life: talking, playing, connecting with family, hitting all their milestones. Then, somewhere between ages 2 and 4, something changed. They began losing skills they had already learned language, social connection, even motor skills like walking or using the bathroom independently. In some cases, this regression came along with a seizure disorder.
Because this regression is so sudden and significant, CDD was treated as its own separate, severe form of autism for a long time.
A Quick Note on Rett Syndrome
You might come across Rett Syndrome mentioned in the same breath as these autism types, and it makes sense why kids with Rett Syndrome can show social withdrawal and communication struggles that look a lot like autism on the surface.
But here’s the key difference: scientists found a specific genetic mutation that causes Rett Syndrome. Because it has this clear, distinct genetic root, it’s no longer classified as a type of autism at all it’s considered its own separate neurological condition, even though it was grouped with autism-related diagnoses in the past.
Why Did Doctors Combine All These Types Into One Diagnosis?
Good question — and it’s one a lot of parents ask.
The honest answer is that these older categories just weren’t holding up well in real-world use. Studies comparing outcomes for kids diagnosed with PDD-NOS versus classic autism found the differences weren’t nearly as clear-cut as the separate labels suggested. On top of that, different clinicians often disagreed on which label fit a particular child, which meant a diagnosis sometimes depended more on which doctor you saw than on the child’s actual needs.
So the shift to a single “Autism Spectrum Disorder” diagnosis, paired with support levels, was really about accuracy and consistency making sure people get support based on what they actually need, not on a label that might not fit them perfectly.
Types of Autism vs. Levels of Autism — What's Actually Different?
This trips a lot of people up, so let’s lay it out side by side.
|
Old “Types” System (before 2013) |
Current “Levels” System (today) |
|
|
What it’s based on |
Separate, named diagnoses |
Amount of daily support needed |
|
Number of categories |
4 main types (plus Rett, later removed) |
3 levels |
|
Examples |
Asperger’s, PDD-NOS, Autistic Disorder, CDD |
Level 1, Level 2, Level 3 |
|
Officially used today? |
No |
Yes |
|
Focus |
What symptoms someone has |
How much help someone needs |
If you want a deeper breakdown of what each level actually looks like day-to-day, we’ve written a full guide on that too.
Common Myths About Autism Types (Let's Clear These Up)
Myth: Asperger’s was a “less real” or “fake” form of autism. Not true at all. It was simply a milder presentation on the same spectrum — just as real and just as deserving of understanding and support.
Myth: If someone doesn’t fit one “type” perfectly, they don’t have autism. This is actually part of why the old system got replaced. Autism rarely fits into neat little boxes, which is exactly why the spectrum model and the levels system makes more sense today.
Myth: These old terms are medically wrong to use now. Not wrong, just outdated for new diagnoses. Plenty of people still identify with terms like “Asperger’s” personally, and that’s completely valid language and identity often move at a different pace than clinical manuals.
Myth: Autism “types” tell you how smart or capable someone is. Nope. Intelligence and ability vary enormously within every single one of these categories and every current level. Support needs and intelligence are two completely separate things.
Signs That Might Point Toward an Autism Diagnosis
Regardless of which historical “type” a presentation might resemble, here are some early signs that often prompt parents or doctors to look further into a possible autism diagnosis:
- Limited or unusual eye contact
- Not responding consistently when their name is called
- Delayed speech, or speech that develops and then regresses
- Difficulty sharing enjoyment or pointing things out to others
- Strong preference for routines, and distress when those routines change
- Repetitive movements like hand-flapping, rocking, or spinning
- Intense, narrow focus on specific interests
- Sensory sensitivities — to sounds, textures, lights, or certain foods
If several of these sound familiar, it’s worth having a conversation with a pediatrician or a developmental specialist. Getting an early evaluation never hurts, and it opens the door to support sooner rather than later.
How Is Autism Diagnosed Today?
Since the old “types” aren’t used anymore, you might be wondering what actually happens during a modern autism evaluation. In general, it involves:
- A detailed conversation with parents or caregivers about developmental history
- Direct observation of the child’s behavior, communication, and play
- Standardized autism assessment tools used by trained specialists
- A look at whether intellectual or language impairments are also present
- Assigning a support level (1, 2, or 3) based on everything observed
This process usually involves a team — often a developmental pediatrician, psychologist, or a combination of specialists — rather than a single quick appointment.
Wrapping It Up
At the end of the day, whether you grew up hearing “Asperger’s,” came across “PDD-NOS” in an old report, or you’re just trying to understand a recent diagnosis for your child, the core idea hasn’t really changed: autism has always been a spectrum. The labels have just evolved to reflect that better. What matters most isn’t which category someone fits into — it’s making sure they get support and understanding shaped around who they actually are.
If you found this helpful, take a look at our guide on how these categories map onto today’s support levels it’ll make everything click even more.
Want to understand how these old categories connect to today’s diagnosis system? Check out our guide on [Autism Levels Explained] to see exactly how support needs are classified now.
Common Questions About Autism Types
Is Asperger's syndrome still diagnosed today?
No. Since 2013, Asperger's syndrome has been folded into the single diagnosis of Autism Spectrum Disorder (ASD). Many people diagnosed before this change still use the term to describe themselves personally.
What is the rarest type of autism?
Childhood Disintegrative Disorder (CDD) was considered the rarest and most severe of the historical autism types, though it is no longer used as a separate diagnosis.
Is PDD-NOS the same as autism?
PDD-NOS was an earlier diagnosis that fell under the same broad umbrella as autism. Today, it would generally be diagnosed as Autism Spectrum Disorder (ASD).
Is Rett syndrome a type of autism?
No. While Rett syndrome shares a few surface-level traits with autism, it has a distinct genetic cause and is classified as its own separate condition.
What replaced the different types of autism?
The DSM-5 replaced the separate autism categories with one single diagnosis — Autism Spectrum Disorder. Instead of separate type names, autism is described using three levels of support needs.
Can someone still be diagnosed with Asperger's today?
No. Doctors no longer issue Asperger's syndrome as a separate diagnosis. Someone showing those traits today would typically be diagnosed with Autism Spectrum Disorder, often described as Level 1 when their support needs fit that level.
Why did they get rid of the different autism types?
Mainly because the categories overlapped too much and were not consistently applied across doctors. A single spectrum diagnosis, paired with support levels, provides a clearer and more consistent picture of a person's support needs.
Is high-functioning autism a real diagnosis?
Not officially. "High-functioning autism" has generally been an informal term rather than a clinical diagnosis. Today, people sometimes use it to describe someone who may have lower support needs, including someone who could be diagnosed with Autism Spectrum Disorder at Level 1.