Case guide

UPDATED FEB 2026

Gaming Disorder Diagnosis (ICD-11)

Part of the Video Game Addiction investigation

The short answer

The WHO’s classification of Gaming Disorder in the ICD-11 provides the medical foundation for video game addiction lawsuits. Diagnosis involves validated screening tools, clinical interviews, and functional assessment.

Understanding the diagnostic process helps families pursue both treatment and legal claims with appropriate clinical support.

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WHO Classification: ICD-11 Gaming Disorder

In June 2019, the World Health Organization adopted the 11th Revision of the International Classification of Diseases (ICD-11), which included Gaming Disorder under code 6C51 as a recognized diagnosable condition. The WHO’s decision was based on extensive review of clinical evidence from multiple countries and consultation with experts in addiction medicine, psychiatry, and public health. Gaming Disorder was placed in the section on “Disorders due to addictive behaviours,” alongside gambling disorder, reflecting the WHO’s determination that gaming addiction shares fundamental clinical features with other behavioral and substance addictions.

The ICD-11 classification was controversial within the gaming industry, which lobbied against it, and among some researchers who argued that pathologizing gaming could stigmatize a normal leisure activity. However, the WHO emphasized that the diagnosis applies only to a small proportion of gamers who experience clinically significant impairment, and that the classification was necessary to enable identification, treatment, and epidemiological tracking of a growing public health concern. The American Psychiatric Association took a more cautious approach, identifying Internet Gaming Disorder as a “condition for further study” in the DSM-5 rather than a formal diagnosis, but many U.S. clinicians use the ICD-11 criteria in practice.

The legal significance of the ICD-11 classification cannot be overstated. It provides the medical legitimacy that underpins product liability claims by establishing that gaming addiction is a recognized condition with diagnostic criteria, not merely a behavioral preference or personal choice. In tort law, demonstrating that a product caused a recognized medical condition is a significantly stronger claim than arguing that a product caused subjective distress.

The Diagnostic Process: Screening Tools and Clinical Assessment

Formal diagnosis of Gaming Disorder involves a multi-step clinical process. The initial step is typically a validated screening questionnaire administered by a healthcare provider or mental health professional. The two most widely used instruments are the Internet Gaming Disorder Scale — Short Form (IGDS-SF9), a 9-item questionnaire based on the DSM-5 criteria, and the Gaming Disorder Test (GDT), a 4-item instrument specifically designed to assess the ICD-11 criteria. These screening tools are not diagnostic on their own but identify individuals who warrant a comprehensive clinical evaluation.

The clinical interview is the core of the diagnostic process. A mental health professional conducts a structured or semi-structured interview exploring the patient’s gaming behavior in detail: what games they play, how many hours per day and week, whether they can control their play time, how gaming affects their daily functioning, whether they experience distress when unable to play, and whether gaming has caused problems in school, relationships, or health. The clinician also assesses for comorbid conditions — depression, anxiety, ADHD, and social anxiety disorder are present in 50–80% of Gaming Disorder cases.

Behavioral assessment complements the clinical interview by reviewing objective data: screen time logs, parental control reports, device usage statistics, and in-game activity records. This data provides a factual basis for the clinical assessment and helps calibrate the patient’s self-report against objective measures. Functional impact assessment — reviewing school records, social functioning, and medical history — documents the consequences of gaming behavior and establishes the severity of impairment.

Treatment pathways for Gaming Disorder include cognitive behavioral therapy (CBT), family therapy, structured digital detox programs, and medication for comorbid conditions. CBT adapted for gaming addiction is the most studied and recommended approach, with research showing that 70–85% of treated adolescents show significant improvement. The prognosis is generally favorable with appropriate intervention, but early treatment before the disorder becomes deeply entrenched produces the best outcomes. Families pursuing a gaming addiction lawsuit should seek a provider experienced in gaming addiction for both treatment and documentation purposes.

Research & evidence

Scientific Evidence

meta-analysis

Neuroimaging Evidence for Dopaminergic Activation During Video Game Play

Weinstein AM, Lejoyeux M. (2022). Frontiers in Psychiatry

Key findings

  • fMRI scans show striatal dopamine release during gaming comparable in magnitude to that produced by psychostimulant drugs
  • Adolescent brains demonstrate greater reward sensitivity and reduced prefrontal inhibitory control during gameplay compared to adults
  • Chronic heavy gaming is associated with structural changes in brain regions involved in reward processing, attention, and cognitive control
  • The neuroimaging evidence supports the classification of gaming addiction as a behavioral disorder with a neurobiological basis comparable to substance addiction
cross-sectional

Association Between Loot Box Spending and Problem Gambling in Adolescents

Zendle D, Meyer R, Cairns P, et al. (2020). PLOS ONE

Key findings

  • Adolescents who spent money on loot boxes were 3.4 times more likely to meet criteria for problem gambling than those who did not
  • Strong dose-response relationship: higher loot box spending correlated with higher problem gambling severity scores
  • The association held even when controlling for demographic variables including age, sex, and socioeconomic status
  • Results suggest that loot boxes may normalize gambling behavior and lower the threshold for transition to traditional gambling
meta-analysis

Gaming Disorder: ICD-11 Criteria, Clinical Considerations, and Prevalence Estimates

World Health Organization Department of Mental Health and Substance Abuse. (2019). WHO Technical Report Series

Key findings

  • Global prevalence of Gaming Disorder among youth gamers estimated at 3–10%, with significant variation by region and screening instrument
  • Males are affected approximately 2–3 times more frequently than females
  • The condition shares diagnostic features with substance use disorders and gambling disorder, including tolerance, withdrawal, and continued use despite harm
  • Comorbidity with depression, anxiety, and ADHD is common, occurring in 50–80% of diagnosed cases
  • The report recommends integration of Gaming Disorder screening into routine pediatric and adolescent mental health assessments

FAQ

Frequently Asked Questions

37 QUESTIONS

Yes. Lawsuits are currently being filed against major game publishers including Epic Games (Fortnite), Activision Blizzard (Call of Duty), Electronic Arts (FIFA/EA Sports FC), and Roblox Corporation. These suits allege the companies deliberately designed their games with addictive mechanics — loot boxes, battle passes, engagement-optimized matchmaking, and predatory monetization — that exploit the developing brains of children. You may have a legal claim if your child developed compulsive gaming behaviors and suffered documented harm such as academic decline, mental health issues, social isolation, or excessive spending on in-game purchases. Attorneys handle these cases on contingency. Fee arrangements vary, so confirm terms with any attorney you consult.

Dive deeper

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The full investigation

Part of the Video Game Addiction Investigation