Types of autism and the 3 autism levels

Page summary

Types of autism were once separate diagnoses, and today they’re one diagnosis: autism spectrum disorder. That single diagnosis is described by three levels of support, not by type. A level describes how much support someone needs, not how autistic they are. You can check here what an older label on a report meant and what each level describes. It also shows what a level leaves out and where to go next. AuDHD Psychiatry assesses adults and children for autism online, across the UK.

Most people start with the same question: how many types of autism are there? The answer has changed, so it’s no wonder the words are confusing. One site says “types”, another says “levels”, and a forum uses words that aren’t in any manual. An older report may name a diagnosis that no clinician gives today. Parents, adults and people diagnosed years ago under an older name all bring this question to AuDHD Psychiatry. This guide untangles the labels without judging anyone who still uses one.

At a glance

• One diagnosis: the older types of autism were folded into a single diagnosis, autism spectrum disorder [1] [2].
• Three levels: requiring support (level 1), requiring substantial support (level 2) and requiring very substantial support (level 3) [2].
• What a level rates: the support needed in social communication, and in restricted or repetitive behaviour [2].
• In the UK: NICE, which sets care standards for the NHS in England, says a diagnosis should be based on DSM-5 or ICD-11 criteria [3].

How many types of autism are there?

Today there’s one diagnosis of autism, not several types. Autism spectrum disorder, or ASD, is the medical term for a diagnosis of autism [4]. The older names you may still come across were separate diagnoses under an earlier system, and the next section goes through them.

The word “spectrum” is often misread as a line from “more” autistic to “less” autistic. The National Autistic Society says that isn’t right: each autistic person has their own combination of characteristics, with different strengths and challenges [5]. Two people can share the same diagnosis and need very different things from the people around them.

Autism classification still matters, because it changes what you read on a report. The same person could be described with an older name on one report and with a level on a newer one. If you’re new to all of this, start with what autism is, which covers the condition itself.

What were the older types of autism called?

Before 2013, the American manual listed four separate autism diagnoses. The manual is published by the American Psychiatric Association. Its fifth edition, DSM-5, replaced the four with one diagnosis, autism spectrum disorder [1] [2]. The table shows what each older label meant and where it went.

Old label	What it described, in plain words	What happened to it
Autistic disorder, often called classic autism or Kanner’s autism	Social communication differences, with a delay in language or thinking skills [2]	Became part of autism spectrum disorder [1]
Asperger’s syndrome	Social differences with no delay in language or thinking skills [2]	Became part of autism spectrum disorder [1]
Pervasive developmental disorder not otherwise specified (PDD-NOS)	Autistic characteristics that didn’t meet the full criteria for the other labels	Became part of autism spectrum disorder [1]
Childhood disintegrative disorder	A loss of skills a child had already gained, after a period of typical development	Became part of autism spectrum disorder [1]

Someone who’d once have had PDD-NOS, but doesn’t meet the autism criteria, may now be given social communication disorder instead [2]. Anyone diagnosed under the old system should still meet the DSM-5 criteria for autism spectrum disorder, or another diagnosis [1]. In other words, the name on an old report changed, not the person.

Asperger syndrome was retired as a diagnosis in 2013, when DSM-5 was published [6]. The World Health Organization’s manual, ICD-11, followed in 2019 and folded it into autism spectrum disorder too [6]. If that was your diagnosis, our guide to Asperger’s syndrome covers what the change means for you.

What are the 3 autism levels?

The three autism levels describe how much support a person needs in daily life. DSM-5 added them alongside the single diagnosis, and they’re set by the support a person needs [2] [7]. You’ll often see them called levels of support. A level is given separately for each of the two core areas: social communication, and restricted or repetitive behaviour [2]. So one person can have a different level in each area.

A level is a description added to an autism diagnosis. It isn’t a type of autism, and it isn’t a diagnosis of its own [7]. A higher level means more support, not “more autism”. Read it as a snapshot of someone’s support needs at the time they were assessed, not a verdict on who they are.

Level 1 autism: requiring support

At level 1, the differences show most when support isn’t in place. Without support, differences in social communication cause noticeable difficulties [2]. Starting a conversation can be hard, and replies to other people can miss the mark [2]. Routine is the other side of it. Inflexible routines get in the way in one or more parts of life [2]. Switching between tasks and planning ahead are hard too [2]. None of that means daily life is easy. Level 1 can still mean that work, study or home life is very hard without the right support. Our guide to level 1 autism goes into what it looks like day to day and what tends to help.

Level 2 autism: requiring substantial support

Level 2 means the differences show even when support is in place [2]. Spoken and unspoken communication both differ in marked ways, and the person starts social contact less often [2]. Behaviour is the other half of the picture. Inflexible or repetitive behaviour happens often enough for a passer-by to notice, and it gets in the way across settings [2]. In practice, that often means support in more than one place: at school or work, and at home. What the support looks like depends on the person, not on the number. Our guide to level 2 autism goes further into communication, daily life and what helps.

Level 3 autism: requiring very substantial support

Level 3 autism is the level given when someone needs the most support. Differences in spoken and unspoken communication affect daily life a great deal, and the person very rarely starts social contact [2]. Responses to others are minimal, change is extremely hard, and inflexible behaviour interferes in every part of life [2]. None of that describes the whole person.

The levels rate the core autistic characteristics only. Things like limited spoken language or a learning disability can shape daily life a great deal [8]. They’re described alongside the level, not by it [8]. Support can come from more than one place. NICE says autistic adults who need help with daily living can be offered structured life-skills training, whatever their intellectual ability [9]. For children, NICE suggests a social-communication programme, delivered by a trained professional together with parents, carers or teachers [10]. A level shows the support someone needs. It says nothing about their potential.

Why a type or level only tells part of the story

A level is a useful shorthand, and it has real limits. The manual gives only a brief description of how to choose between the three levels [7]. Clinicians often disagree on which one to give [7]. In practice, a level often isn’t recorded at all. In a US study of the records of 15,450 autistic children, fewer than half had any level recorded at all [7]. So two reports written about the same person can read quite differently.

Needs also move. A person’s abilities and needs vary and can change over time [11]. So a level given at one assessment isn’t fixed for life. That cuts both ways: support can go up as well as down. DSM-5 itself says the levels shouldn’t be used to decide who’s eligible for services [7]. Some autistic people worry that levels could be used to limit support, or to lump together people with different needs [7]. Those are the limits to hold in mind when you read a label, your own or your child’s.

Profiles and labels you may hear about

Online, you’ll meet labels that aren’t in DSM-5 or ICD-11. People sort autistic people into “sensory” or “social” profiles, or by how they communicate. Those are ways of describing an experience, not types in either manual. How visible someone’s characteristics are can change with the situation, or with autistic masking, when someone hides their traits [5]. Autism itself isn’t a learning disability, and it isn’t a mental health condition either [5].

One profile you’ll hear about often is pathological demand avoidance (PDA), which some people and organisations use to describe their experience. A profile can help you put words to what you see. It doesn’t change the diagnosis, and it doesn’t replace an assessment.

How autism can look at different ages

Autism is lifelong, but what the people around you notice changes with age. Signs can be noticed in early childhood, yet autism is often not diagnosed until much later [11]. For a child, the question often comes up when something new is asked of them, like starting school. Our guide to autism in children covers what parents and teachers see first, and what to do next.

Adults often reach the question after years of getting by, sometimes after a child’s assessment or a change at work. Our page on autism in adults sets out how it can look once the demands of adult life pile up. If you’re wondering about a daughter, a sister or yourself, start with how autism can look in women and girls.

What support looks like at any level

Support follows what a person needs, not the label on their report. Autism isn’t an illness, and there’s no treatment for autism itself [4]. There are ways of managing it and of getting support, though [4]. Where that support comes from depends on your age and situation. The NHS lists your GP or local autism team, your local council, and your school, college or workplace [12]. Local services and national charities fill in around them [12].

What kind of help works depends on the person. For adults who find social situations hard, NICE suggests a social learning programme, in a group or one to one [9]. Psychosocial support means talking, learning and skills-based help. The World Health Organization says there’s evidence it can improve communication and social skills [11]. A level alone can’t set any of that, which is why support follows the person. Our guide to autism support and treatment covers the options in depth.

Where to start if you think you might be autistic

An assessment may help if:

• Social communication, change or routine have been hard since childhood.
• It causes real problems at home, school, work or with people.
• You’ve wondered for years whether autism explains it.

It might not be right today if:

• You need urgent help now. Call NHS 111 and choose the mental health option, or in Northern Ireland call Lifeline free on 0808 808 8000, any time. In an emergency, call 999 or go to A&E [13].
• You want a level named for a form, which no checklist can give.

AuDHD Psychiatry runs the adult autism assessment as two online appointments: the assessment, then an interview with someone who knows you well. We can still assess you if no one can take part. The child autism assessment (ages 6 to 17) and the assessment for ADHD and autism together each take three. No GP referral is needed. An outcome letter comes the next day, the full report within two weeks. The free autism test is a screen, not a diagnosis; the free 15-minute call is information, not an assessment.

Questions people ask

What are the different kinds of autism?

Today there’s one diagnosis, autism spectrum disorder, and the old kinds are no longer given. Names like classic autism, Asperger’s syndrome and PDD-NOS come from an earlier manual. What differs between autistic people isn’t the kind of autism they have. It’s their own mix of traits, and the support they need from day to day.

Is mild autism the same as level 1 autism?

No: a level describes how much support someone needs, and the spectrum isn’t a straight line from “less” to “more” autistic [5]. So a level says nothing about how autistic a person is. “Mild autism” isn’t a term in any manual, and “level 1” isn’t a polite word for it. Someone at level 1 can still find daily life very hard without the right support. The label doesn’t make that struggle any smaller.

What do people mean by severe or low-functioning autism?

“Severe” and “low-functioning” are informal words, not labels from any manual. The manual describes the support someone needs instead, and its third level covers people who need the most support [2]. “Severe autism” or “low-functioning autism” usually means someone whose support needs are high and visible. Many autistic people find “low-functioning” hurtful, because it judges the person rather than describing the support they need.

Is Asperger’s still a type of autism?

Not any more: Asperger syndrome is no longer given, and it was folded into autism spectrum disorder [6]. Some people who were diagnosed with it still use the name for themselves, often because it’s part of their identity [6]. That’s their choice. An older report that says Asperger’s isn’t wrong; the name is what changed, not the person.

Can an autism level change?

Yes, because needs change. A person’s abilities and needs vary and can change over time [11]. So the level that fits at one assessment won’t always fit later. A 2023 research review found that estimates of change in autism traits ranged from 11 to 58 in 100 people [8]. That range depends on the group studied and the measure used. Some people’s traits lessen over time, and some people’s increase [8].

Does everyone diagnosed with autism get a level?

Not always. In a US study of the records of 15,450 autistic children, fewer than half had a level recorded [7]. In the UK, a diagnosis can rest on DSM-5 or ICD-11 criteria. Whether a report names a level varies from service to service. AuDHD Psychiatry’s autism reports do state a support level. If your report has no level, the diagnosis is still a full diagnosis. Ask the clinician who assessed you if you want your support needs described.

In short

The names on older reports describe one condition, and clinicians now give one diagnosis for it. The three levels say how much support a person needs, and nothing about how autistic they are. Language, learning and the day you’re having shape life at least as much as any level does. If a label has left you with more questions than answers, you’re not alone. AuDHD Psychiatry can take you through what an assessment involves, and the call is the place to ask first.

Related

• how ADHD and autism differ and overlap
• autistic burnout

Sources

1. American Psychiatric Association. Autism Spectrum Disorder fact sheet, DSM-5. 2013. https://www.psychiatry.org/File%20Library/Psychiatrists/Practice/DSM/APA_DSM-5-Autism-Spectrum-Disorder.pdf
2. Masi A, DeMayo MM, Glozier N, Guastella AJ. An Overview of Autism Spectrum Disorder, Heterogeneity and Treatment Options. Neuroscience Bulletin, April 2017. https://pmc.ncbi.nlm.nih.gov/articles/PMC5360849/
3. National Autistic Society. Criteria and tools used in an autism assessment. Read 01/10/2026. https://www.autism.org.uk/advice-and-guidance/diagnosis/assessment-and-diagnosis/criteria-and-tools-used-in-an-autism-assessment
4. NHS. What is autism? Read 01/10/2026. https://www.nhs.uk/conditions/autism/what-is-autism/
5. National Autistic Society. What is autism? Read 01/10/2026. https://www.autism.org.uk/advice-and-guidance/what-is-autism
6. National Autistic Society. Asperger syndrome (Asperger’s). Last reviewed June 2023, read 01/10/2026. https://www.autism.org.uk/advice-and-guidance/what-is-autism/the-history-of-autism/asperger-syndrome
7. Russell A, Tinker SC, Shaw KA, Maenner MJ. Prevalence of Autism Spectrum Disorder Severity Levels From the Fifth Edition of the Diagnostic and Statistical Manual (DSM-5) in the Autism and Developmental Disabilities Monitoring Network. Journal of Autism and Developmental Disorders, 2026. https://pmc.ncbi.nlm.nih.gov/articles/PMC13267130/
8. Waizbard-Bartov E, Fein D, Lord C, Amaral DG. Autism severity and its relationship to disability. Autism Research, 2023. https://pmc.ncbi.nlm.nih.gov/articles/PMC10500663/
9. National Institute for Health and Care Excellence (NICE). Autism spectrum disorder in adults: diagnosis and management, guideline CG142. Published 27 June 2012, last updated 14 June 2021. https://www.nice.org.uk/guidance/cg142/chapter/Recommendations
10. National Institute for Health and Care Excellence (NICE). Autism spectrum disorder in under 19s: support and management, guideline CG170. Published 28 August 2013, last updated 14 June 2021. https://www.nice.org.uk/guidance/cg170/chapter/Recommendations
11. World Health Organization. Autism, fact sheet. 17 September 2025. https://www.who.int/news-room/fact-sheets/detail/autism-spectrum-disorders
12. NHS. Help and support for autistic people and their families. Read 01/10/2026. https://www.nhs.uk/conditions/autism/support/
13. nidirect. Mental health emergency: if you’re in crisis or despair. Read 29/09/2026. https://www.nidirect.gov.uk/articles/mental-health-emergency-if-youre-crisis-or-despair

About AuDHD Psychiatry

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Last updated: 13 October 2026