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ICD-9 Code 318.0 - Moderate intellectual disabilities

Reviewed by Medicinsk Expert•Last updated: 2026-10-22•ICD Codes

ICD-9-CM Diagnosis Code 318.0

Diagnosis Code: 318.0 (Raw: 3180)

Description: Moderate intellectual disabilities

Classification: International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)

Fiscal Year: 2026 Reference

CMS Section 111 Status: Valid for reporting.

Overview & Historical Usage

ICD-9-CM code 318.0 is designated for Moderate intellectual disabilities. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical clinical data analysis.

Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.