Autism was first formally recognized as its own diagnosis in 1980, when “infantile autism” was added as a distinct condition in the DSM‑III (the main psychiatric diagnostic manual used in the U.S.).

Quick Scoop: Key Dates

  • 1911 – Swiss psychiatrist Eugen Bleuler uses the word “autism” to describe a set of symptoms seen in schizophrenia, not yet a separate diagnosis.
  • 1943–1944 – Leo Kanner (1943) publishes on “early infantile autism,” and Hans Asperger (1944) describes “autistic psychopathy,” helping frame autism as a distinct developmental pattern in children.
  • 1952 & 1968 (DSM‑I & DSM‑II) – Autism is not its own diagnosis; behaviors we now associate with autism are usually classified under childhood schizophrenia or similar labels.
  • 1980 (DSM‑III) – “Infantile autism” appears for the first time as a separate diagnosis, defined as a pervasive developmental disorder , distinct from schizophrenia.
  • 1987 (DSM‑III‑R) – The term changes to “autistic disorder,” with a more detailed checklist of diagnostic criteria.
  • 1994 (DSM‑IV) – Autism is explicitly treated as a spectrum for the first time, adding Asperger’s disorder, Rett syndrome, childhood disintegrative disorder, and PDD‑NOS under the broader autism umbrella.
  • 2013 (DSM‑5) – The separate diagnoses (autistic disorder, Asperger’s, PDD‑NOS) are merged into autism spectrum disorder (ASD) as one continuum with varying support needs.

So, if you’re asking “when was autism recognized as a diagnosis?” in the strict sense of a standalone developmental diagnosis in the modern manuals, the key year is 1980 , with important groundwork laid in the 1940s and spectrum recognition in 1994.

A tiny story to put it in context

For most of the 1900s, many children who would now be recognized as autistic were labeled “odd,” “eccentric,” or misdiagnosed with childhood schizophrenia or blamed on “cold parenting.” It was only after Kanner and Asperger’s work in the 1940s, followed by decades of research and the DSM‑III in 1980, that clinicians had a clearer name and set of criteria for what they were seeing.

Simple timeline table (HTML as requested)

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Year Event Why it matters
1911 Bleuler uses “autism” for symptoms within schizophrenia.Term appears, but not yet a separate diagnosis.
1943–1944 Kanner describes “early infantile autism”; Asperger describes “autistic psychopathy.”Autism starts to be seen as a distinct developmental pattern in children.
1952–1968 DSM‑I and DSM‑II describe autism‑like traits mostly as childhood schizophrenia.Autism not yet recognized as its own diagnostic category.
1980 DSM‑III adds “infantile autism” as a pervasive developmental disorder.First modern, stand‑alone autism diagnosis in a major manual.
1987 DSM‑III‑R changes the term to “autistic disorder,” expands criteria.More structured and consistent diagnoses.
1994 DSM‑IV recognizes autism as a spectrum; adds Asperger’s, Rett, CDD, PDD‑NOS under PDD.Formal recognition of a broader autism spectrum.
2013 DSM‑5 creates “autism spectrum disorder” as a single diagnosis.Current framework: one spectrum with different levels of support.
**TL;DR:** Autism has existed throughout human history, but it became a **formal, stand‑alone diagnosis** in 1980 (DSM‑III), with the idea of an **autism spectrum** crystallizing in 1994 and the modern “autism spectrum disorder” label arriving in 2013.

Information gathered from public forums or data available on the internet and portrayed here.