Is ADHD in the DSM-5?

Yes, ADHD is in the DSM-5, in the Neurodevelopmental Disorders chapter

The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, published by the American Psychiatric Association in 2013 and updated as the DSM-5-TR in 2022, is the diagnostic reference used by clinicians in Canada. ADHD appears in it under its full name, attention-deficit/hyperactivity disorder. If you are looking for it in the book, it is in the opening chapter on neurodevelopmental disorders, which groups conditions that begin in the developmental period and affect how the brain matures. The chapter runs through intellectual developmental disorder, communication disorders, autism spectrum disorder, ADHD, specific learning disorder and motor disorders, in that order.

That placement is itself meaningful. Earlier editions filed ADHD among disorders usually first diagnosed in infancy, childhood or adolescence, which reinforced the idea that it was a childhood condition people outgrew. Moving it into a neurodevelopmental chapter that explicitly includes adults reflected the evidence that ADHD persists across the lifespan. The plain-language guide to DSM-5-TR ADHD criteria walks through each criterion in detail.

The DSM-5 defines ADHD by symptom lists, thresholds, onset, settings and impairment

The entry is structured like every other DSM diagnosis: a set of criteria labelled A through E, followed by specifiers. Criterion A lists eighteen symptoms in two groups, and the remaining criteria set conditions that must all be met. In summary:

• Criterion A, inattention. Nine symptoms such as careless mistakes, difficulty sustaining attention, not seeming to listen, not following through, disorganization, avoiding sustained mental effort, losing things, distractibility and forgetfulness.
• Criterion A, hyperactivity-impulsivity. Nine symptoms such as fidgeting, leaving one's seat, restlessness, inability to engage quietly, being on the go, talking excessively, blurting out answers, difficulty waiting and interrupting.
• Thresholds. Six or more symptoms in a group for children, five or more for people aged 17 and older, lasting at least six months and inconsistent with developmental level.
• Criterion B, onset. Several symptoms present before age 12.
• Criterion C, settings. Symptoms present in two or more settings, such as home, school, work or social situations.
• Criterion D, impairment. Clear evidence that symptoms interfere with or reduce the quality of functioning.
• Criterion E, exclusions. Symptoms are not better explained by another mental disorder and do not occur only during a psychotic disorder.

Specifiers then record the presentation, the severity as mild, moderate or severe, and whether the condition is in partial remission, meaning full criteria were previously met but fewer than the full set have been present for the past six months while impairment continues.

The DSM-5 lists three presentations, each with its own diagnostic code

Clinicians record which pattern of symptoms has been present for the past six months. The presentations and their codes, which Canadian records and insurance forms often use, are below.

The word presentation replaced subtype in DSM-5 because research showed people move between patterns over time, most commonly from combined in childhood toward predominantly inattentive in adulthood.

DSM-5 changed the ADHD criteria in ways that matter especially for adults

If you were assessed years ago, or have read older material, several things are different now. The DSM-5 revisions in 2013 were aimed squarely at making the criteria fit adolescents and adults better:

• Age of onset moved from 7 to 12. Symptoms now need to have been present before age 12 rather than causing impairment before age 7, which is far easier to establish from memory.
• A lower adult threshold. Five symptoms rather than six for people aged 17 and over, acknowledging that hyperactivity in particular becomes less visible with age.
• Adult examples added. Each symptom now includes descriptions that apply to adults, such as difficulty keeping appointments or returning calls.
• Autism no longer an exclusion. ADHD and autism spectrum disorder can be diagnosed together.
• Subtypes became presentations. Reflecting change over time rather than fixed categories.
• Severity and remission specifiers. Added to describe where a person currently sits.

The DSM-5-TR in 2022 updated text and the diagnostic codes but left these criteria intact. Canada's other major classification, the World Health Organization's ICD-11, defines ADHD similarly but with some differences in structure; the comparison between ICD-11 and DSM-5-TR for ADHD sets them side by side.

In a Canadian assessment, the DSM-5-TR is the standard, but the manual is not a checklist

The Canadian ADHD Resource Alliance (CADDRA) guidelines direct clinicians to diagnose ADHD against DSM-5-TR criteria, and that is what a diagnosis letter means when it says the criteria were met. Meeting criteria is established through a structured clinical interview and validated rating scales rather than by reading the symptom list to a patient, and a careful assessment spends as much time on the exclusion criterion, ruling out anxiety, depression, sleep problems and other conditions that mimic ADHD, as on counting symptoms.

Finding Focus provides online ADHD assessment and treatment for adults and teens in several Canadian provinces, assessing against DSM-5-TR criteria in line with CADDRA guidance. After a short online intake you have one consultation with a licensed Canadian clinician, no referral is needed, and assessments start from $399.