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HomeConditionsAutism & Neurodevelopmental DisordersIntellectual Disability
Mental Health Condition

Intellectual Disability

To define Intellectual Disability: Significant limitations in intellectual functioning and adaptive behavior that begin during childhood, affecting learning and daily life skills.

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

By HeyPsych Contributor
Reviewed by the HeyPsych Medical Review Board
Reviewed by the HeyPsych Medical Review Board
Board-certified psychiatrists and mental health professionals
Medical Review Board
Published: August 15, 2025
Last Updated: August 25, 2026
Last Reviewed: August 25, 2026

What It Is

What It Is

Overview

Overview

What It Looks Like

What It Looks Like

Symptoms

Symptoms

Diagnosis

Diagnosis

Treatment

Treatment

Real Stories

Real Stories

FAQs

FAQs

Get Help

Get Help

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.

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