The DSM-5

What is the DSM-5?

The Diagnostic and Statistical Manual of Mental Disorders (DSM) is a classification system published by the American Psychiatric Association (APA). It provides standardised criteria for diagnosing mental health and neurodevelopmental conditions.

The current edition is the DSM-5-TR (Text Revision), published in March 2022, which updated the DSM-5 originally released in 2013.¹

How the DSM-5 works

The DSM-5 uses a categorical approach to diagnosis. This means a person either meets the criteria for a condition or does not. Each condition has a set of diagnostic criteria - specific symptoms, behaviours, or impairments that must be present for a diagnosis to be made.

For most conditions, the DSM-5 also requires that:

• Symptoms cause clinically significant distress or impairment in social, occupational, or other important areas of functioning
• Symptoms are not better explained by another condition
• Symptoms have been present for a minimum period of time

The DSM-5 organises conditions into chapters. Neurodevelopmental disorders - including ADHD, autism spectrum disorder, specific learning disorders, and developmental coordination disorder - are grouped in the first chapter, reflecting the understanding that these conditions have developmental origins.

Key conditions for neurodivergent people

ADHD

The DSM-5 classifies ADHD as a neurodevelopmental disorder with three presentations: predominantly inattentive, predominantly hyperactive-impulsive, and combined.

Key changes in the DSM-5 and DSM-5-TR include:

• The age of onset was raised from 7 to 12 years old, recognising that symptoms may not become apparent until later
• The symptom threshold for adults was lowered to five symptoms (from six for children), reflecting evidence that clinically significant ADHD can present with fewer symptoms in adults2
• ADHD and autism can now be diagnosed together - the DSM-IV previously treated autism as an exclusionary criterion for ADHD1

Autism spectrum disorder

The DSM-5 merged several previously separate diagnoses - autistic disorder, Asperger syndrome, childhood disintegrative disorder, and PDD-NOS (Pervasive Developmental Disorder Not Otherwise Specified) - into a single category: autism spectrum disorder (ASD).

The diagnostic criteria focus on two core areas:

1. Persistent deficits in social communication and social interaction
2. Restricted, repetitive patterns of behaviour, interests, or activities

Severity is specified using support levels (Level 1, 2, or 3), reflecting how much support a person needs rather than categorising them as “high” or “low functioning.”

The DSM-5-TR updated the wording to allow clinicians to note co-occurring “problems” alongside autism, replacing the previous requirement that co-occurring issues meet the threshold for a separate “disorder.”¹

Other neurodevelopmental conditions

The DSM-5 also covers:

• Specific learning disorders (dyslexia, dyscalculia) - diagnosed when academic skills are substantially below age expectations
• Developmental coordination disorder (dyspraxia) - characterised by difficulties with motor coordination
• Communication disorders - including language disorder and social (pragmatic) communication disorder
• Tic disorders - including Tourette syndrome

Limitations and criticisms

The DSM-5 has been widely criticised, both as a general framework and in its approach to neurodevelopmental conditions specifically.

Categorical boundaries

The DSM-5 draws hard lines between “disordered” and “normal.” In reality, conditions like ADHD and autism exist on a continuum. The categorical approach means some people who clearly struggle do not meet the threshold for diagnosis, while others who meet criteria may not feel the label fits them.

Deficit-based language

The DSM-5 describes neurodevelopmental conditions primarily in terms of deficits, impairments, and dysfunction. For example, autism is defined by “deficits in social communication” - language that many autistic people find reductive and harmful.

Neglect of context

Critics have pointed out that the DSM-5 places relatively little emphasis on the role of environment, social context, and systemic factors. For ADHD, the manual acknowledges that symptoms may be “minimal or absent” in certain situations - such as when someone is engaged in interesting activities or receiving frequent rewards - yet still classifies the condition as a fixed neurodevelopmental disorder.²

This tension between context-dependent presentation and fixed diagnostic categories remains unresolved.

Cultural and gender bias

The DSM-5’s diagnostic criteria were largely developed based on research involving white males. This has contributed to the underdiagnosis of ADHD and autism in women, girls, and people from minority ethnic backgrounds, whose presentations may not match the “typical” profile described in the manual.

Inter-rater reliability

Studies have shown that different clinicians applying DSM-5 criteria to the same person do not always arrive at the same diagnosis. This inconsistency raises questions about how reliable categorical diagnosis really is.³

The DSM-5 and the ICD-11

The DSM-5 and ICD-11 overlap significantly but are not identical. Key differences include:

• The ICD-11 uses a more dimensional approach, particularly for personality disorders, while the DSM-5 remains primarily categorical
• The DSM-5 is published by the APA and is most widely used in the US and in research; the ICD-11 is published by the WHO and is the standard for international health reporting
• The ICD-11 explicitly states that autism spectrum disorder should generally take precedence over personality disorder in differential diagnosis - a position the DSM-5 does not make as clearly
• The UK NHS currently uses ICD-10 for clinical coding, though clinicians may reference DSM-5 criteria during assessment

Read more about the ICD-11

What this means for you

If you are seeking or have received a diagnosis, you may encounter DSM-5 language and criteria in assessment reports, clinical letters, and research.

Understanding how the DSM-5 works can help you:

• Make sense of assessment reports - knowing what criteria were used and why
• Advocate for yourself - particularly if you feel your presentation does not fit the “textbook” description
• Understand the limitations - a diagnostic manual is a tool, not the final word on your experience
• Ask better questions - such as which criteria the assessor used, and whether they considered differential diagnoses

Further reading on neurobetter

• Understanding diagnosis - overview
• The ICD-11
• Getting a diagnosis
• Late diagnosis
• ADHD screening tools

neurobetter services

• Local services directory - find assessment and support services near you
• Online community - connect with others navigating diagnosis
• Ask a Counsellor - get a confidential response from a registered counsellor