Asperger’s syndrome wasn’t simply renamed. It was absorbed into a broader diagnosis called Autism Spectrum Disorder (ASD) when the American Psychiatric Association published the fifth edition of its Diagnostic and Statistical Manual (DSM-5) in 2013. The change reflected years of research showing that Asperger’s couldn’t be reliably distinguished from other forms of autism, and that the separate label was creating real problems for families trying to access services.
The Diagnostic Problem Behind the Change
Under the previous manual (DSM-IV), clinicians had several separate diagnoses to choose from: autistic disorder, Asperger’s disorder, and pervasive developmental disorder not otherwise specified (PDD-NOS). The main thing that supposedly set Asperger’s apart was the absence of early language delay. A child who showed social difficulties and restricted interests but spoke on time could receive an Asperger’s diagnosis, while a child with similar traits who talked late would be diagnosed with autism.
In practice, this distinction fell apart. Clinicians applied the labels inconsistently. One clinician might diagnose a child with Asperger’s while another, evaluating the same child, would assign a PDD-NOS or high-functioning autism diagnosis instead. Research found a clear lack of reliability across clinicians in assigning these subcategories. The language-delay criterion was especially problematic: children with Asperger’s often had precocious language development, but some children diagnosed with autism also eventually developed strong communication skills, meaning they might have qualified for an Asperger’s diagnosis later in life. Distinguishing the two conditions based solely on when a child started speaking turned out to be scientifically weak.
Brain imaging research reinforced this conclusion. Studies comparing brain structure in people with Asperger’s versus those with autism found differences in degree rather than kind. People with Asperger’s showed fewer areas of structural difference from typical brains, likely because their language systems were relatively spared during development. But there was no clear biological boundary separating Asperger’s from autism. The evidence pointed toward a single spectrum with varying levels of support needs, not distinct conditions.
How the Separate Label Hurt Access to Services
The inconsistent diagnoses had consequences beyond clinical settings. Schools and insurance companies were often confused about what Asperger’s and PDD-NOS actually meant, and whether children with those diagnoses qualified for the same services as children diagnosed with autism. Some families found that an Asperger’s diagnosis, perceived as “milder,” made it harder to get therapy, classroom accommodations, or insurance coverage for treatment. A child who struggled significantly but carried the Asperger’s label could be turned away from supports that a child with an autism diagnosis would receive automatically.
By folding everything into a single Autism Spectrum Disorder diagnosis, the revision aimed to create a common language that schools, insurers, and clinicians could all understand. Rather than debating which subcategory a child belonged to, clinicians now rate the level of support a person needs (Level 1 through Level 3) and note specific details like whether intellectual or language impairment is present. The idea was that a unified label would make it easier for everyone on the spectrum to access appropriate help.
The Global Shift Followed
The DSM is used primarily in the United States, but the World Health Organization’s diagnostic manual, the ICD, is used in much of the rest of the world. In 2019, the WHO released the ICD-11, which made the same change: Asperger syndrome was discontinued as a separate diagnosis and folded into Autism Spectrum Disorder. The ICD-11 also dropped the requirement for a history of delayed language onset, directly reflecting the fact that Asperger’s was no longer a valid standalone category. This meant the change was not just an American decision but a global consensus.
Hans Asperger’s Troubled Legacy
The diagnostic reasons for the change were established well before 2018, but that year added a darker dimension to the conversation. Historian Herwig Czech published a meticulously researched paper in the journal Molecular Autism concluding that Hans Asperger, the Austrian pediatrician the syndrome was named after, had actively collaborated with the Nazi regime during World War II. Czech’s research showed that Asperger referred profoundly disabled children to the Am Spiegelgrund clinic in Vienna, where children deemed “genetically defective” were killed through starvation and lethal injections, with their deaths recorded as pneumonia.
A book published the same year by historian Edith Sheffer, titled “Asperger’s Children,” reached similar conclusions: Asperger was not simply a reluctant participant trying to survive under an oppressive regime but a willing contributor to the Nazi eugenics program. The editors of Molecular Autism wrote that they were “persuaded” Asperger “was not just doing his best to survive in intolerable conditions but was also complicit with his Nazi superiors in targeting society’s most vulnerable people.”
These findings didn’t cause the diagnostic change, which had already happened five years earlier. But they gave many people in the autism community an additional reason to move away from the Asperger’s label entirely.
Why Some People Still Use the Term
Despite the official change, “Asperger’s” hasn’t disappeared from everyday conversation. Many adults who received the diagnosis before 2013 built their sense of identity around it. The term “Aspie” became a point of pride and community belonging for people who felt that a general autism label didn’t capture their specific experience. Some worry that being grouped under the broad ASD umbrella erases the particular challenges and strengths associated with what was previously called Asperger’s.
Language preferences within the autism community are themselves evolving. A U.S. survey of nearly 300 autistic adults found that they overwhelmingly preferred identity-first language (“autistic person”) over person-first language (“person with autism”). Professionals working in the field, by contrast, were more likely to use person-first phrasing. These preferences vary by country and by individual, and they continue to shift as the community’s voice grows louder in shaping how autism is discussed.
What the Current Diagnosis Looks Like
Under the DSM-5, a person receives an ASD diagnosis based on two core areas: persistent difficulties with social communication, and restricted or repetitive patterns of behavior or interests. Clinicians then add specifiers describing the person’s support needs, whether intellectual disability or language impairment is present, and whether any co-occurring conditions exist. A 2022 text revision (DSM-5-TR) made minor wording tweaks for clarity but left the core criteria unchanged.
The practical effect is that someone who would have been diagnosed with Asperger’s in 2010 would today receive a diagnosis of Autism Spectrum Disorder, Level 1 (requiring support), typically without intellectual or language impairment noted. The clinical profile is the same. What changed is the framework around it, designed to be more consistent, more scientifically grounded, and more useful for getting people the support they need.