Asperger’s syndrome and autism are no longer separate diagnoses. Since 2013, what was once called Asperger’s has been folded into a single diagnosis called autism spectrum disorder (ASD). But the question still makes sense, because the two labels described meaningfully different experiences for decades, and many people still use the term “Asperger’s” to describe themselves. Understanding the old distinction, why it was removed, and what replaced it helps make sense of how autism is diagnosed and discussed today.
Why the Diagnoses Were Merged
Before 2013, the diagnostic manual used by mental health professionals in the United States listed Asperger’s disorder and autistic disorder as separate conditions. In practice, clinicians struggled to reliably tell them apart. Two evaluators could see the same child and reach different conclusions about which label applied, particularly when distinguishing Asperger’s from what was informally called “high-functioning autism.” The American Psychiatric Association described the old system as trying to “cleave meatloaf at the joints,” meaning the categories didn’t reflect natural boundaries in how autism actually presents.
The DSM-5, published in May 2013, replaced the separate subtypes with one umbrella diagnosis: autism spectrum disorder. The World Health Organization followed suit with its own classification system, the ICD-11, also dropping Asperger’s as a standalone category. Both organizations concluded that a single spectrum better reflects what we know about the condition’s biology and the wide range of ways it shows up in people’s lives.
How Asperger’s Was Originally Defined
Under the old criteria, Asperger’s disorder shared autism’s core feature: persistent difficulty with social interaction. But it came with two important exclusions. First, there could be no clinically significant delay in language. Children who used single words by age 2 and communicative phrases by age 3 met this requirement. Second, there could be no significant delay in cognitive development, self-help skills, or general curiosity about the world during childhood.
In other words, a child with Asperger’s hit their early developmental milestones on time. They learned to talk and think at a typical pace. Their struggles were social: reading facial expressions, understanding unwritten social rules, navigating conversations, and connecting with peers. They also showed the restricted interests and repetitive behaviors seen across the autism spectrum, like intense fixation on narrow topics or strong preferences for routine.
Classic autistic disorder, by contrast, was diagnosed when language and cognitive delays were present alongside social difficulties and repetitive behaviors. A child who didn’t speak until age 4 or who had significant intellectual disability would have received an autism diagnosis rather than Asperger’s.
Cognitive Differences Between the Two Profiles
Research on cognitive testing revealed distinct patterns in children diagnosed under the old categories. Children with an Asperger’s diagnosis tended to score highest on verbal tasks. Half showed a notable peak in vocabulary, and about 29% excelled at identifying abstract similarities between concepts. Their verbal reasoning scores often exceeded their scores in other areas by a wide margin.
Children diagnosed with autistic disorder showed the opposite pattern. Their strongest scores appeared on visual and nonverbal reasoning tasks like assembling block designs and solving visual puzzles, while verbal comprehension lagged behind. This difference, verbal strengths in Asperger’s versus visual-spatial strengths in autism, was one of the most consistent findings in the research.
One area of shared difficulty was processing speed, particularly on timed tasks requiring visual-motor coordination like copying symbols quickly. Children with Asperger’s scored significantly lower than their peers on these tasks despite having similar overall IQ scores. This helps explain why many people with this profile find tasks like handwriting or timed tests frustrating, even when they’re intellectually capable.
What Replaced the Old Categories
Today’s autism spectrum disorder diagnosis uses a severity system with three levels based on how much support a person needs in daily life. Level 1 means “requires support,” Level 2 means “requires substantial support,” and Level 3 means “requires very substantial support.” The levels are assessed separately for two areas: social communication, and restricted or repetitive behaviors.
A person who would have been diagnosed with Asperger’s under the old system would most likely receive a Level 1 ASD diagnosis today. They have social communication challenges and restricted interests, but their language developed on time and they don’t need intensive daily support. Someone who would have received a classic autism diagnosis with significant language delay or intellectual disability might be classified at Level 2 or Level 3, depending on the extent of support they need.
The key shift is that the spectrum is no longer divided into distinct boxes. Instead, it recognizes that people with autism vary along multiple dimensions, including verbal ability, intellectual functioning, sensory sensitivity, and the intensity of repetitive behaviors, and that these dimensions don’t always cluster neatly into types.
What Sets Autism Apart From Similar Conditions
The merger created a new neighboring diagnosis: social (pragmatic) communication disorder, or SCD. This condition captures people who have significant social communication difficulties but lack the restricted and repetitive behavior patterns that define autism. No lining up objects, no intense narrow interests, no distress over changes in routine, no unusual sensory reactions.
The social difficulties in SCD and autism can look very similar on the surface. Both involve trouble using language in social contexts, reading nonverbal cues, and adjusting communication style to fit different situations. The distinguishing factor is those repetitive behaviors and focused interests. If they’re present, or were present earlier in life, the diagnosis is ASD. The two diagnoses are mutually exclusive: a person receives one or the other, never both.
Why Some People Still Use “Asperger’s”
The diagnostic label may be retired, but it remains part of many people’s identity. Adults who were diagnosed before 2013 often grew up understanding themselves through the lens of Asperger’s. The term “Aspie” became a way to describe a specific experience of the world: socially awkward but intellectually engaged, struggling with small talk but deeply passionate about niche interests. For many, that label captured something that “autism spectrum disorder, Level 1” does not.
The term also carries some baggage. Hans Asperger, the Austrian pediatrician the condition was named after, has been linked to the Nazi regime’s child euthanasia program, which has led some in the autism community to move away from the name. Others feel the label remains useful shorthand for a particular set of traits and prefer to keep it.
Current prevalence data from the CDC estimates that about 1 in 31 children (3.2%) are identified with autism spectrum disorder, with boys diagnosed over three times as often as girls. That number includes everyone across the spectrum, from people who would have once been called Asperger’s to those with the most significant support needs. The broadening of the diagnosis, combined with better screening, has contributed to the steady rise in reported prevalence over the past two decades.
Practical Implications of the Change
If you or someone you know was diagnosed with Asperger’s, that diagnosis is still valid and doesn’t need to be “upgraded.” Clinicians today simply use ASD with a severity level instead. The practical difference matters most for children being evaluated now: they’ll receive an ASD diagnosis with specific notes about their language ability, intellectual functioning, and support needs rather than a separate label.
For adults seeking a diagnosis for the first time, knowing the history is useful because older screening tools and online resources still reference Asperger’s. If you recognize yourself in descriptions of Asperger’s, you’re looking at what would now be diagnosed as ASD Level 1. The traits are the same; only the label has changed.