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DSM-5 Criteria for Identifying Intellectual Disabilities

Written by \"\"Dr. Brindusa VantaMedically reviewed by \"\"Brittany Ferri, Ph.D.

Published on · Updated on

Intellectual disability (ID) is a developmental condition that affects a person’s ability to think, learn, and perform everyday tasks. These challenges begin before age 18 and can range from mild to profound. Understanding intellectual disabilities helps clinicians, educators, and families recognize the condition early, provide appropriate interventions, and support individuals in leading meaningful, fulfilling lives.

\"Young

Key takeaways

  • Intellectual disability involves limitations in both intellectual abilities and adaptive functioning that begin during development.
  • Diagnosis considers clinical assessment and everyday conceptual, social, and practical skills rather than IQ alone.
  • Severity and support planning reflect adaptive needs, with individualized assistance helping people participate in daily life.

What Is Intellectual Disability?

According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), intellectual disability (ID) involves significant limitations in intellectual functioning, such as reasoning and problem-solving, and adaptive behavior, including communication and self-care.

Individuals with ID may struggle with school, relationships, or daily routines. These deficits can impact an individual’s ability to reason, plan, solve problems, learn academically, think abstractly, make sound judgments, and manage everyday tasks⁠[1].

The DSM-5 outlines three core criteria for diagnosing ID:

    \n
  1. Onset must occur during the developmental period.
    2. \n
  2. Another medical condition cannot fully explain deficits.
    3. \n
  3. There must be measurable impairments in intellectual and adaptive functioning. 
    4. \n

 All three criteria must be met for a clinical diagnosis, guiding professionals in identifying and supporting individuals with intellectual disability.

Subject matter expert

\"\"

Dr. Roy Sugarman

Neuroscience and clinical mental health

View experience

Deficiencies in Intellectual Activities

Intellectual disability involves measurable impairments in intellectual functioning, typically identified through standardized intelligence tests and comprehensive clinical evaluation. An intelligence quotient (IQ) score below 70 is commonly used as a benchmark for significant intellectual impairment.

However, diagnosis does not rely on IQ scores alone. Clinicians also consider cultural, social, and linguistic factors to ensure a fair and accurate assessment of an individual’s cognitive abilities⁠[1].

Adaptive Functioning Deficit

In addition to intellectual impairments, individuals with intellectual disability experience deficits in adaptive functioning. This refers to how well a person manages everyday tasks and responsibilities, relative to age, community, and cultural expectations. The DSM-5 breaks adaptive functioning into three key domains:

    \n
  • Conceptual (Academic): Skills related to reading, writing, math, time management, and self-direction.
    • \n
  • Social: The ability to communicate, understand social rules, form relationships, and interpret social cues.
    • \n
  • Practical: Competence in personal care, managing money, organizing tasks, and functioning at work or school.
    • \n

When adaptive functioning is significantly impaired, individuals may struggle to live independently and meet the demands of daily life within their community or peer group. These challenges require lifelong support tailored to the individual's needs and environment.

Severity Levels of Intellectual Disability

The DSM-5 categorizes intellectual disability into four severity levels: They are mild, moderate, severe, and profound, based on an individual's level of adaptive functioning and need for support⁠[1].

Mild Intellectual Disability

Individuals with mild intellectual disability may struggle with academic subjects such as reading, writing, and math. Although they often need money management and decision-making support, many can live independently and perform basic self-care tasks with minimal assistance. Social challenges may arise due to difficulties interpreting subtle cues or understanding complex social dynamics.

Moderate Intellectual Disability

Those with moderate intellectual disability generally reach an academic level equivalent to second grade. While they require ongoing support with daily living, they can acquire essential self-care abilities. They may experience difficulty understanding social norms and handling interpersonal challenges, leading to social isolation or conflict.

Severe Intellectual Disability

People with severe intellectual disability show minimal academic progress and may develop only basic skills like counting or letter recognition. Daily supervision is essential, particularly for personal care and communication, which is often limited to simple words or gestures.

Profound Intellectual Disability

Profound intellectual disability involves significant deficits in intellectual and adaptive functioning. Individuals with this level of disability require round-the-clock care for all daily needs. In many cases, they also live with physical disabilities or sensory impairments that further limit their independence and communication abilities.

Diagnosing Intellectual Disability

Diagnosing intellectual disability involves comprehensively evaluating intellectual functioning and adaptive behavior. This process goes beyond standardized testing—it requires clinical observation, interviews, and careful consideration of cultural, linguistic, and environmental contexts that may affect performance⁠[2]. A team typically diagnoses professionals, including psychologists, physicians, and educational specialists.

A critical part of diagnosis includes assessing:

    \n
  • Intellectual Functioning: Typically measured using standardized IQ tests. An IQ score below approximately 70–75 suggests a limited intellectual ability.
    • \n
  • Adaptive Functioning: Evaluated across three domains, conceptual, social, and practical, to determine how well an individual manages daily life compared to peers of the same age and cultural background.
    • \n

Common Assessment Tools

    \n
  • Wechsler Intelligence Scale for Children (WISC) and Wechsler Adult Intelligence Scale (WAIS): Widely used to assess intellectual functioning across age groups.
    • \n
  • Vineland Adaptive Behavior Scales: Measures personal and social skills needed for everyday living.
    • \n
  • Stanford-Binet Intelligence Scales: Another common IQ assessment used to evaluate cognitive abilities.
    • \n

These assessments are combined with interviews, developmental history, and observations to ensure an accurate diagnosis, essential for creating an effective treatment or support plan tailored to the individual's needs.

Differential Diagnosis

Several conditions can mimic the presentation of an intellectual disability, and it is essential to make differential diagnoses.

Global Developmental Delay (GDD)

This neurological disorder is characterized by slow psychomotor development, which leads to reduced activity and mental functioning.

Global developmental delay describes significant delays in at least two developmental domains in children under five. Follow-up assessment helps clarify the child’s developmental profile and support needs, including whether intellectual developmental disorder is present[5].

Borderline Intellectual Functioning

People functionally marked as borderline intellectual functioning have IQ scores between 71 and 84, higher than those typical of ID but less than average. While they may struggle with some of the same issues that would qualify someone for ID in academic and occupational situations, they would not meet ID criteria from a clinical perspective⁠[1].

Other Neurodevelopmental Disorders

ID can overlap with autism spectrum disorder (ASD), language disorders, and learning disabilities, but different symptom profiles identify the latter. For example, ASD is characterized by deficits in social communication and restricted behaviors, whereas ID involves global deficits in cognitive and adaptive domains⁠[2].

An accurate diagnosis minimizes the risk of mislabeling or missing co-occurring conditions and provides clinicians with essential information to make interventions.

Common Comorbidities

Intellectual disability (ID) often occurs alongside other medical, genetic, and neurodevelopmental conditions, which can complicate the clinical picture but also provide valuable insight into its underlying causes.

One of the most frequently co-occurring conditions is Autism Spectrum Disorder (ASD). While social communication difficulties and repetitive behaviors characterize ASD, individuals with both ASD and ID often share overlapping challenges in social and adaptive functioning⁠[1].

Attention-deficit/hyperactivity disorder (ADHD) is another common comorbidity. Difficulties with attention, impulse control, and executive functioning in individuals with ID can significantly interfere with learning and day-to-day skills⁠[3].

Several genetic conditions are also strongly linked with ID, including Down syndrome, Fragile X, and Williams syndrome. Identifying a genetic cause informs treatment strategies and can help predict developmental outcomes.

Understanding and addressing these comorbidities is key to developing comprehensive, personalized care plans supporting the individual’s well-being⁠[4].

Supporting Individuals with Intellectual Disability

The DSM-5 criteria for intellectual disability offer a clear and practical framework for identifying and understanding this complex neurodevelopmental condition. These guidelines enable accurate diagnosis and meaningful intervention by focusing on deficits in intellectual functioning and adaptive behavior, with an onset during the developmental period.

This approach helps clinicians tailor care to individual needs and equips educators, families, and support networks with the insight needed to advocate for and assist those affected. With early identification, compassionate support, and evidence-based care, individuals with intellectual disability can be empowered to reach their full potential and lead fulfilling lives.

References

  1. Boat, T. F., & Wu, J. T. (2015). Clinical Characteristics of Intellectual Disabilities. Nih.gov; National Academies Press (US). National Library of Medicine. Accessed May 30 2025.
  2. McQuaid, G. A., Pelphrey, K. A., Bookheimer, S. Y., Dapretto, M., Webb, S. J., Bernier, R. A., McPartland, J. C., Van Horn, J. D., & Wallace, G. L. (2021). The gap between IQ and adaptive functioning in autism spectrum disorder: Disentangling diagnostic and sex differences. Autism, 25(6), 136236132199562. PubMed. Accessed May 30 2025.
  3. Choo, Y. Y., Agarwal, P., How, C. H., & Yeleswarapu, S. P. (2019). Developmental delay: identification and management at primary care level. Singapore Medical Journal, 60(3), 119–123. smj.org.sg. Accessed May 30 2025.
  4. Schalock, R. L., Luckasson, R., & Shogren, K. A. (2007). The renaming of mental retardation: Understanding the change to the term intellectual disability. Intellectual and Developmental Disabilities, 45(2), 116-124. meridian.allenpress.com. Accessed May 30 2025.
  5. Assessing children and youth with global developmental delay and intellectual developmental disorder. (n.d.). cps.ca. Accessed October 10 2026.

Medical Content

The Clinical Affairs Team at MentalHealth.com is a dedicated group of medical professionals with diverse and extensive clinical experience. They actively contribute to the development of content, products, and services, and meticulously review all medical material before publication to ensure accuracy and alignment with current research and conversations in mental health. For more information, please visit the Editorial Policy.

About MentalHealth.com

MentalHealth.com helps people understand themselves, build healthier relationships, and access the right care. We bring together mental health education, diagnostics, and care management to support well-being throughout every phase of life.

\"\"

Author

Dr. Brindusa Vanta

Ph.D.

Dr. Brindusa Vanta is a writer and medical reviewer specializing in personality disorders, stress, anger, and self-esteem. She holds an MD from Iuliu Hatieganu University of Medicine in Romania and a diploma in homeopathic medicine from the Ontario College of Homeopathic Medicine in Canada.

Published
Updated
\"\"

Medical Reviewer

Brittany Ferri, Ph.D.

OTR/L

Brittany Ferri, Ph.D., is a medical reviewer and subject matter expert in behavioral health, pediatrics, and telehealth.

Reviewed
\"\"

Related community

Lifespan Development

Explore growth, transitions, and mental health through the different stages of life.

Explore community
","text":"Home Library Assessments & Diagnosis DSM-5 Criteria for Identifying Intellectual Disabilities DSM-5 Criteria for Identifying Intellectual Disabilities Written by Dr. Brindusa VantaMedically reviewed by Brittany Ferri, Ph.D. Published on May 15, 2025 · Updated on May 13, 2026 Intellectual disability (ID) is a developmental condition that affects a person’s ability to think, learn, and perform everyday tasks. These challenges begin before age 18 and can range from mild to profound. Understanding intellectual disabilities helps clinicians, educators, and families recognize the condition early, provide appropriate interventions, and support individuals in leading meaningful, fulfilling lives. Key takeaways Intellectual disability involves limitations in both intellectual abilities and adaptive functioning that begin during development. Diagnosis considers clinical assessment and everyday conceptual, social, and practical skills rather than IQ alone. Severity and support planning reflect adaptive needs, with individualized assistance helping people participate in daily life. What Is Intellectual Disability? According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), intellectual disability (ID) involves significant limitations in intellectual functioning, such as reasoning and problem-solving, and adaptive behavior, including communication and self-care. Individuals with ID may struggle with school, relationships, or daily routines. These deficits can impact an individual’s ability to reason, plan, solve problems, learn academically, think abstractly, make sound judgments, and manage everyday tasks⁠[1]. The DSM-5 outlines three core criteria for diagnosing ID: Onset must occur during the developmental period. Another medical condition cannot fully explain deficits. There must be measurable impairments in intellectual and adaptive functioning. All three criteria must be met for a clinical diagnosis, guiding professionals in identifying and supporting individuals with intellectual disability. Subject matter expert Dr. Roy Sugarman Neuroscience and clinical mental health View experience Deficiencies in Intellectual Activities Intellectual disability involves measurable impairments in intellectual functioning, typically identified through standardized intelligence tests and comprehensive clinical evaluation. An intelligence quotient (IQ) score below 70 is commonly used as a benchmark for significant intellectual impairment. However, diagnosis does not rely on IQ scores alone. Clinicians also consider cultural, social, and linguistic factors to ensure a fair and accurate assessment of an individual’s cognitive abilities⁠[1]. Adaptive Functioning Deficit In addition to intellectual impairments, individuals with intellectual disability experience deficits in adaptive functioning. This refers to how well a person manages everyday tasks and responsibilities, relative to age, community, and cultural expectations. The DSM-5 breaks adaptive functioning into three key domains: Conceptual (Academic): Skills related to reading, writing, math, time management, and self-direction. Social: The ability to communicate, understand social rules, form relationships, and interpret social cues. Practical: Competence in personal care, managing money, organizing tasks, and functioning at work or school. When adaptive functioning is significantly impaired, individuals may struggle to live independently and meet the demands of daily life within their community or peer group. These challenges require lifelong support tailored to the individual's needs and environment. Severity Levels of Intellectual Disability The DSM-5 categorizes intellectual disability into four severity levels: They are mild, moderate, severe, and profound, based on an individual's level of adaptive functioning and need for support⁠[1]. Mild Intellectual Disability Individuals with mild intellectual disability may struggle with academic subjects such as reading, writing, and math. Although they often need money management and decision-making support, many can live independently and perform basic self-care tasks with minimal assistance. Social challenges may arise due to difficulties interpreting subtle cues or understanding complex social dynamics. Moderate Intellectual Disability Those with moderate intellectual disability generally reach an academic level equivalent to second grade. While they require ongoing support with daily living, they can acquire essential self-care abilities. They may experience difficulty understanding social norms and handling interpersonal challenges, leading to social isolation or conflict. Severe Intellectual Disability People with severe intellectual disability show minimal academic progress and may develop only basic skills like counting or letter recognition. Daily supervision is essential, particularly for personal care and communication, which is often limited to simple words or gestures. Profound Intellectual Disability Profound intellectual disability involves significant deficits in intellectual and adaptive functioning. Individuals with this level of disability require round-the-clock care for all daily needs. In many cases, they also live with physical disabilities or sensory impairments that further limit their independence and communication abilities. Diagnosing Intellectual Disability Diagnosing intellectual disability involves comprehensively evaluating intellectual functioning and adaptive behavior. This process goes beyond standardized testing—it requires clinical observation, interviews, and careful consideration of cultural, linguistic, and environmental contexts that may affect performance⁠[2]. A team typically diagnoses professionals, including psychologists, physicians, and educational specialists. A critical part of diagnosis includes assessing: Intellectual Functioning: Typically measured using standardized IQ tests. An IQ score below approximately 70–75 suggests a limited intellectual ability. Adaptive Functioning: Evaluated across three domains, conceptual, social, and practical, to determine how well an individual manages daily life compared to peers of the same age and cultural background. Common Assessment Tools Wechsler Intelligence Scale for Children (WISC) and Wechsler Adult Intelligence Scale (WAIS): Widely used to assess intellectual functioning across age groups. Vineland Adaptive Behavior Scales: Measures personal and social skills needed for everyday living. Stanford-Binet Intelligence Scales: Another common IQ assessment used to evaluate cognitive abilities. These assessments are combined with interviews, developmental history, and observations to ensure an accurate diagnosis, essential for creating an effective treatment or support plan tailored to the individual's needs. Differential Diagnosis Several conditions can mimic the presentation of an intellectual disability, and it is essential to make differential diagnoses. Global Developmental Delay (GDD) This neurological disorder is characterized by slow psychomotor development, which leads to reduced activity and mental functioning. Global developmental delay describes significant delays in at least two developmental domains in children under five. Follow-up assessment helps clarify the child’s developmental profile and support needs, including whether intellectual developmental disorder is present[5]. Borderline Intellectual Functioning People functionally marked as borderline intellectual functioning have IQ scores between 71 and 84, higher than those typical of ID but less than average. While they may struggle with some of the same issues that would qualify someone for ID in academic and occupational situations, they would not meet ID criteria from a clinical perspective⁠[1]. Other Neurodevelopmental Disorders ID can overlap with autism spectrum disorder (ASD), language disorders, and learning disabilities, but different symptom profiles identify the latter. For example, ASD is characterized by deficits in social communication and restricted behaviors, whereas ID involves global deficits in cognitive and adaptive domains⁠[2]. An accurate diagnosis minimizes the risk of mislabeling or missing co-occurring conditions and provides clinicians with essential information to make interventions. Common Comorbidities Intellectual disability (ID) often occurs alongside other medical, genetic, and neurodevelopmental conditions, which can complicate the clinical picture but also provide valuable insight into its underlying causes. One of the most frequently co-occurring conditions is Autism Spectrum Disorder (ASD). While social communication difficulties and repetitive behaviors characterize ASD, individuals with both ASD and ID often share overlapping challenges in social and adaptive functioning⁠[1]. Attention-deficit/hyperactivity disorder (ADHD) is another common comorbidity. Difficulties with attention, impulse control, and executive functioning in individuals with ID can significantly interfere with learning and day-to-day skills⁠[3]. Several genetic conditions are also strongly linked with ID, including Down syndrome, Fragile X, and Williams syndrome. Identifying a genetic cause informs treatment strategies and can help predict developmental outcomes. Understanding and addressing these comorbidities is key to developing comprehensive, personalized care plans supporting the individual’s well-being⁠[4]. Supporting Individuals with Intellectual Disability The DSM-5 criteria for intellectual disability offer a clear and practical framework for identifying and understanding this complex neurodevelopmental condition. These guidelines enable accurate diagnosis and meaningful intervention by focusing on deficits in intellectual functioning and adaptive behavior, with an onset during the developmental period. This approach helps clinicians tailor care to individual needs and equips educators, families, and support networks with the insight needed to advocate for and assist those affected. With early identification, compassionate support, and evidence-based care, individuals with intellectual disability can be empowered to reach their full potential and lead fulfilling lives. References Boat, T. F., & Wu, J. T. (2015). Clinical Characteristics of Intellectual Disabilities. Nih.gov; National Academies Press (US). National Library of Medicine. Accessed May 30 2025. McQuaid, G. A., Pelphrey, K. A., Bookheimer, S. Y., Dapretto, M., Webb, S. J., Bernier, R. A., McPartland, J. C., Van Horn, J. D., & Wallace, G. L. (2021). The gap between IQ and adaptive functioning in autism spectrum disorder: Disentangling diagnostic and sex differences. Autism, 25(6), 136236132199562. PubMed. Accessed May 30 2025. Choo, Y. Y., Agarwal, P., How, C. H., & Yeleswarapu, S. P. (2019). Developmental delay: identification and management at primary care level. Singapore Medical Journal, 60(3), 119–123. smj.org.sg. Accessed May 30 2025. Schalock, R. L., Luckasson, R., & Shogren, K. A. (2007). The renaming of mental retardation: Understanding the change to the term intellectual disability. Intellectual and Developmental Disabilities, 45(2), 116-124. meridian.allenpress.com. Accessed May 30 2025. Assessing children and youth with global developmental delay and intellectual developmental disorder. (n.d.). cps.ca. Accessed October 10 2026. Medical Content The Clinical Affairs Team at MentalHealth.com is a dedicated group of medical professionals with diverse and extensive clinical experience. They actively contribute to the development of content, products, and services, and meticulously review all medical material before publication to ensure accuracy and alignment with current research and conversations in mental health. For more information, please visit the Editorial Policy. About MentalHealth.com MentalHealth.com helps people understand themselves, build healthier relationships, and access the right care. We bring together mental health education, diagnostics, and care management to support well-being throughout every phase of life. Author Dr. Brindusa Vanta Ph.D. Dr. Brindusa Vanta is a writer and medical reviewer specializing in personality disorders, stress, anger, and self-esteem. She holds an MD from Iuliu Hatieganu University of Medicine in Romania and a diploma in homeopathic medicine from the Ontario College of Homeopathic Medicine in Canada. Published May 15, 2025 Updated May 13, 2026 Medical Reviewer Brittany Ferri, Ph.D. OTR/L Brittany Ferri, Ph.D., is a medical reviewer and subject matter expert in behavioral health, pediatrics, and telehealth. Reviewed May 15, 2025 Related community Lifespan Development Explore growth, transitions, and mental health through the different stages of life. Explore community Table of contentsChoose a section What Is Intellectual Disability? 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