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HomeConditionsAutism & Neurodevelopmental DisordersIntellectual Disability
Mental Health Condition

Intellectual Disability

Overview

Description

Intellectual Disability (ID) is a neurodevelopmental disorder characterized by significant limitations in both intellectual functioning (reasoning, problem-solving, planning, abstract thinking, academic learning) and adaptive behavior (conceptual, social, and practical skills), originating during the developmental period. Severity is based on adaptive functioning, not IQ score alone.

Prevalence

Estimated prevalence is about 1% globally, with variation based on definition, population studied, and access to testing.

Age of Onset

By definition, onset is in the developmental period (childhood or adolescence).

DSM-5 Code

319

ICD-10 Code

F79

Reviewed by the HeyPsych Medical Review Board
Board-certified psychiatrists and mental health professionals
Medical Review Board
Published: August 15, 2025
Last Updated: January 9, 2026
Last Reviewed: January 9, 2026

Diagnostic Criteria

Symptoms

Prognosis

Evaluation

Specifiers

Neurobiology

Risk Factors

Comorbidities

Warning Signs

Impact On Life

Severity Levels

Treatment Goals

Prognosis Factors

When To Seek Help

Real Life Examples

Developmental Stages

Self Help Strategies

Treatment Approaches

Overdiagnosis Factors

Missed Diagnosis Factors

This information about mental health conditions is for educational purposes only. If you believe you may be experiencing symptoms of a mental health condition, please consult with a qualified healthcare professional for proper evaluation and diagnosis.

Seeking Help for Intellectual Disability?

If you recognize these symptoms in yourself or a loved one, know that help is available. Mental health conditions are treatable with options like Cognitive Behavioral Therapy, and early intervention can make a significant difference.
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