Is Level 1 Autism the Same as Asperger’s? Here’s the Difference

Level 1 autism is not officially the same diagnosis as Asperger’s syndrome, but the two labels describe very similar profiles of the autism spectrum. Asperger’s syndrome was a distinct diagnosis until 2013, when the American Psychiatric Association folded it into the single category of Autism Spectrum Disorder (ASD) in the DSM-5. Today, what many clinicians and families once called Asperger’s syndrome is most often classified as Level 1 autism, meaning the person requires the least amount of daily support among the three official severity levels.

The overlap between these two terms causes real confusion, even among professionals who work in the field every day. Many adults who received an Asperger’s diagnosis decades ago never went through a formal re-evaluation, so they still identify with that original label rather than a level they were never actually assigned. Understanding how the terminology shifted, and why, helps you make sense of a diagnosis you or a loved one may have received at any point over the last thirty years.

Key Takeaways

• Asperger’s syndrome was removed as a separate diagnosis when the DSM-5 was published in May 2013, and it was replaced by the single category of Autism Spectrum Disorder.
• Level 1 autism is the current diagnostic label that most closely matches what used to be called Asperger’s syndrome or high-functioning autism.
• The DSM-5-TR, released in 2022, kept the same three-level system (Level 1, Level 2, Level 3) and did not bring back Asperger’s syndrome as its own category.
• Level 1 means a person needs support, Level 2 means substantial support, and Level 3 means very substantial support, based on how much difficulty someone has with communication and flexible behavior.
• Many people, including adults diagnosed before 2013, still prefer the term Asperger’s syndrome for personal or cultural reasons, and clinicians generally respect that choice.
• Recent CDC surveillance data (2024 to 2025 reports) estimate that roughly 1 in 31 children in the United States falls somewhere on the autism spectrum, spanning all three levels.

What Level 1 Autism and Asperger’s Syndrome Actually Mean

Asperger’s syndrome was first described by Austrian pediatrician Hans Asperger in 1944, though it did not enter the DSM as an official diagnosis until the DSM-IV in 1994. It described children and adults who had typical or above-average language development, average or high intelligence, and social difficulties without the more significant delays seen in classic autism. For nearly two decades, this created a split between “Asperger’s syndrome” and “autistic disorder” as if they were two separate conditions.

That split ended with the DSM-5, published in May 2013 by the American Psychiatric Association. The manual eliminated Asperger’s syndrome, autistic disorder, childhood disintegrative disorder, and pervasive developmental disorder not otherwise specified (PDD-NOS) as distinct labels. All four were merged into one diagnosis: Autism Spectrum Disorder, coded 299.00 (F84.0) in the DSM-5 and DSM-5-TR. Instead of separate categories, the manual introduced three severity levels based on the amount of support a person needs for social communication and for restricted or repetitive behaviors.

Level 1 autism is the mildest of the three levels under this system. A person at Level 1 typically speaks in full sentences, holds conversations, and lives with a fair degree of independence, yet still struggles with the back-and-forth of social interaction, reading unspoken social cues, or adjusting to unplanned changes. This profile lines up closely with what clinicians used to diagnose as Asperger’s syndrome, which is why the two terms get used almost interchangeably in everyday conversation, even though only one of them appears in the current diagnostic manual.

Why Asperger’s Was Removed From the DSM-5

The American Psychiatric Association gave several reasons for merging Asperger’s syndrome into the broader autism spectrum category. Research conducted throughout the 2000s repeatedly found that clinicians applied the Asperger’s label inconsistently. One clinic might diagnose a child with Asperger’s syndrome, while another clinic, looking at nearly identical symptoms, would diagnose autistic disorder or PDD-NOS instead. This inconsistency made the diagnosis unreliable for research, insurance coverage, and treatment planning across different states and countries.

Field trials conducted before the DSM-5 was finalized found that a single spectrum with severity levels produced far more consistent diagnoses among different clinicians than the old, separate-category system did. Rather than debating whether someone technically had “Asperger’s” versus “high-functioning autism” versus “PDD-NOS,” professionals could instead describe support needs on a shared scale of Level 1 through Level 3, based on standardized observation and history.

A separate and more troubling piece of the story surfaced in historical research published around 2018. Medical historians uncovered documentation suggesting that Hans Asperger cooperated with Nazi authorities in Vienna during World War II, including referring some children he evaluated to the Am Spiegelgrund clinic, a facility associated with the euthanasia program targeting children with disabilities. While this history did not directly cause the DSM-5 change, since the diagnostic revision was finalized in 2013 before these findings were widely publicized, it added to broader conversations within the autism community about whether the name itself deserved to remain in use going forward.

How the Three Severity Levels Compare

The DSM-5 and DSM-5-TR sort every autism diagnosis into one of three levels, based on how much support a person needs for social communication and for restricted or repetitive behaviors. Clinicians can rate each domain separately, though most reports use one overall level for simplicity.

• Level 1, requiring support: The person speaks in full sentences but struggles with back-and-forth social exchange and may seem rigid to peers. Trouble switching tasks or organizing independently causes some limits, but daily functioning needs only minimal outside support. This level lines up most closely with the old Asperger’s syndrome diagnosis.
• Level 2, requiring substantial support: Clear deficits show up in both verbal and nonverbal communication, even with support. Social struggles are obvious to casual observers, and inflexible behavior interferes with daily life across multiple settings.
• Level 3, requiring very substantial support: Severe communication deficits cause serious impairment. The person rarely initiates interaction, responds minimally to others, and finds change extremely distressing.

Levels aren’t permanent. Clinicians can adjust them as skills grow, needs shift, or new evaluations come in, one edge this system has over older, fixed category labels.

Level 1 Autism vs. Asperger’s Syndrome: A Side-by-Side Look

Comparing the two terms directly makes the practical differences easier to see, even though the underlying traits overlap heavily.

• Official status: Asperger’s syndrome has not been an official diagnosis in the United States since May 2013. Level 1 autism is the current official term found in the DSM-5-TR.
• Diagnostic code: Asperger’s syndrome once carried its own code (299.80 in the DSM-IV). Level 1 autism falls under the single ASD code, 299.00 (F84.0), with the severity level noted separately in the clinical write-up.
• Language requirement: Asperger’s syndrome traditionally required no clinically significant delay in early language development. Level 1 autism has no such requirement built into the criteria, since language history is no longer a defining feature of the severity level itself.
• Support description: Asperger’s syndrome was described qualitatively, often in terms of “mild” social difficulty. Level 1 autism is described in terms of specific, observable support needs across two domains, which gives clinicians a more standardized way to document severity.
• Common usage today: Asperger’s syndrome remains common in casual conversation, older medical records, and some international contexts, since a handful of countries outside the United States kept a version of the diagnosis longer. Level 1 autism is the term you will see in new evaluations, school records, and insurance paperwork in the United States.

Why the Confusion Still Happens So Often

Anyone diagnosed before May 2013 was never automatically switched to a Level 1 autism diagnosis. Their chart still says Asperger’s, and most never sought a new evaluation just to update a label, since treatment recommendations rarely changed.

Identity plays a big role too. Some adults built a personal identity around the word Asperger’s over years or decades, and see the newer term as erasing part of how they understand themselves. Online communities, support groups, and some published research still use the term, and clinicians generally won’t push someone to drop a label central to their identity.

The phrase “high-functioning autism” adds another layer of confusion. It never appeared in any version of the DSM. People use it loosely for someone who speaks fluently, holds a job, and lives independently, which often overlaps with Level 1 autism, but the phrase has no fixed clinical definition. Someone called “high-functioning” by an observer might actually be assessed at Level 1 or even Level 2, depending on how a clinician measures support needs in a structured evaluation.

The word Asperger’s never disappeared from everyday language, even though it disappeared from the diagnostic manual over a decade ago.

Getting or Updating a Diagnosis Today

Adults diagnosed with Asperger’s before 2013 who want a current evaluation can expect a process with five basic steps.

1. Get a referral from a primary care provider. Most insurance plans require one before covering a specialist visit, and this first appointment costs $150 to $300 without insurance.
2. Schedule a full evaluation with a psychologist or developmental specialist. Testing (often including the ADOS-2) runs $1,200 to $3,500, though university clinics and children’s hospitals often offer sliding-scale rates.
3. Complete structured interviews and questionnaires. Plan on two to four hours across one or two visits, often with input from a spouse or family member on early development.
4. Get a written report with a specific severity level. Reports usually arrive two to four weeks after testing and list Level 1, 2, or 3 instead of the old Asperger’s label.
5. Use the report to access accommodations or services. A current diagnosis with a stated level is often required for workplace accommodations under the ADA, campus disability services, or state-funded adult autism programs.

An updated diagnosis isn’t mandatory for everyone. If your Asperger’s diagnosis already gets you the accommodations or self-understanding you need, there’s no legal requirement to chase a new label. Updating matters most when a new employer, school, or insurance provider specifically asks for documentation using DSM-5-TR terms.

What This Means for Everyday Life

The change in terminology matters less than the practical reality of living with Level 1 autism, regardless of which word you use to describe it. Someone at this level often manages a full-time job, drives, lives independently, and forms lasting relationships, while still experiencing genuine friction in social settings that others may not notice or understand. Sensory sensitivities, a strong preference for routine, and intense focus on specific interests frequently show up alongside the social communication differences, even though these traits are not always visible to coworkers or acquaintances.

Recent CDC surveillance data, based on 2022 monitoring year figures released through the ADDM Network in 2024 and 2025, estimate that roughly 1 in 31 children in the United States falls somewhere on the autism spectrum. Level 1 traits make up a substantial share of new diagnoses, particularly among children identified later in elementary or middle school, since milder social differences are often harder for parents and teachers to spot in early childhood compared to more pronounced developmental delays.

Whether you personally use the word Asperger’s, the phrase high-functioning autism, or the clinical term Level 1 autism, the underlying support needs and daily experiences described are largely the same. What matters most is finding an evaluation, a support plan, and a community that fits how you or your loved one actually experiences the world, rather than getting stuck on which specific label appears on a piece of paper.

Take the Next Step Toward Clarity

If you have questions about a past Asperger’s diagnosis, or you suspect you or your child fits the Level 1 autism profile for the first time, reach out to a licensed psychologist, developmental pediatrician, or your primary care provider to discuss a formal evaluation. Bringing old records, report cards, or notes about early childhood development to that first appointment can speed up the process considerably and give the evaluating clinician a fuller picture of your history.

Conclusion

Level 1 autism and Asperger’s syndrome describe overlapping, closely related profiles, but only one of them, Level 1 autism, exists as an official diagnosis today. The DSM-5 retired Asperger’s syndrome as a standalone category in May 2013, folding it into a single Autism Spectrum Disorder diagnosis with three severity levels, and the DSM-5-TR kept that same structure in 2022. Whatever term feels most accurate to your own experience, understanding how these labels connect can help you communicate more clearly with doctors, schools, and employers about the support you actually need.

Frequently Asked Questions

Is Level 1 autism considered a mild form of autism?

Yes, Level 1 is the mildest of the three official severity levels in the DSM-5-TR. It describes people who need the least amount of daily support for social communication and flexible behavior, compared to Level 2 and Level 3, though “mild” does not mean the challenges are minor or unimportant to the person living with them.

Can someone still be diagnosed with Asperger’s syndrome today?

No, Asperger’s syndrome has not been an official diagnosis in the United States since May 2013. Any new evaluation conducted today under DSM-5-TR criteria will result in an Autism Spectrum Disorder diagnosis with a stated severity level, rather than a separate Asperger’s diagnosis.

Do people with an old Asperger’s diagnosis need to get re-evaluated?

Not necessarily, unless a school, employer, or insurance provider specifically requires current DSM-5-TR documentation. Many adults keep their original diagnosis on record for years without issue, since the practical support recommendations rarely change based on which label appears in the file.

What is the difference between Level 1 and Level 2 autism?

Level 1 requires support, while Level 2 requires substantial support. People at Level 2 show more noticeable social communication deficits even with support in place, and their inflexible behavior interferes with daily functioning across more settings than someone at Level 1 typically experiences.

Why do some clinicians and organizations still use the term Asperger’s?

Personal identity, historical habit, and international variation all contribute to its continued use. Some adults built their sense of identity around the term before 2013 and prefer to keep using it, and certain research studies and support communities outside the United States also continued using it informally even after the DSM-5 change.