2026 ICD-10-CM Diagnosis Code F73Profound intellectual disabilities

ICD-10-CM Codes›F01–F99›F70-F79›F73

ICD-10-CM F73
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F73 is a billable ICD-10-CM diagnosis code for profound intellectual disabilities. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as profound intellectual disability. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurodevelopmental disorders.

Code Identity

ICD-10-CM Code
F73
Billable Status
Yes — Valid for Submission
Code Describes
Profound intellectual disabilities
Chapter
F70-F79
Intellectual disabilities

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF70-F79Intellectual disabilities
CategoryF73Profound intellectual disabilities
This CodeF73Profound intellectual disabilities

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Profound intellectual disability

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • IQ level below 20-25
  • Profound mental subnormality

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disability, disabilities
      • intellectual
        • profound (I.Q. under 20)
    • Idiot, idiocy(congenital)
    • I.Q.
      • under 20

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD014
Neurodevelopmental disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Developmental Disabilities

Developmental disabilities are conditions that are usually present at birth. They can affect a child's growth and development. These conditions can cause physical, learning, language, or behavior issues. They can include:

The full article covers:

  • What are developmental disabilities?
  • What causes developmental disabilities?
  • How are developmental disabilities diagnosed?
  • What are the treatments for developmental disabilities?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert F73 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
318.2 Profnd intellct disablty
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F73Overview

Is F73 (Profound intellectual disabilities) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report profound intellectual disabilities on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of F73?

Under the General Equivalence Mappings, profound intellectual disabilities converts to ICD-9-CM 318.2 (profnd intellct disablty). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.