2026 ICD-10-CM Diagnosis Code F42.9Obsessive-compulsive disorder, unspecified

ICD-10-CM Codes›F01–F99›F40-F48›F42

ICD-10-CM F42.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F42.9 is a billable ICD-10-CM diagnosis code for obsessive-compulsive disorder, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as obsessive compulsive disorder caused by psychoactive substance. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Obsessive-compulsive and related disorders.

Code Identity

ICD-10-CM Code
F42.9
Billable Status
Yes — Valid for Submission
Code Describes
Obsessive-compulsive disorder, unspecified
Short Description
Obsessive-compulsive disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
F42
Obsessive-compulsive disorder

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF40-F48Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders
CategoryF42Obsessive-compulsive disorder
This CodeF42.9Obsessive-compulsive disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Obsessive compulsive disorder caused by psychoactive substance
  • Obsessive-compulsive disorder

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.

    • Disorder(of)
      • obsessive-compulsive

Clinical ClassificationClinical

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

CCSR MBD006
Obsessive-compulsive and related disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Obsessive-Compulsive Disorder

Obsessive-compulsive disorder (OCD) is a mental disorder in which you have thoughts (obsessions) and rituals (compulsions) over and over. They interfere with your life, but you cannot control or stop them.

The full article covers:

  • What is obsessive-compulsive disorder (OCD)?
  • What causes obsessive-compulsive disorder (OCD)?
  • Who is at risk for obsessive-compulsive disorder (OCD)?
  • What are the symptoms of obsessive-compulsive disorder (OCD)?
  • How is obsessive-compulsive disorder (OCD) diagnosed?
  • What are the treatments for obsessive-compulsive disorder (OCD)?

Read the full article at MedlinePlus

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

Convert F42.9 to ICD-9-CMHistory

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

ICD-9-CM
300.3 Obsessive-compulsive dis
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement F42.9 replaces the following previously assigned code(s):

  • F42 - Obsessive-compulsive disorder
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F42.9Overview

Is F42.9 (Obsessive-compulsive disorder) a billable code?

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

What is the ICD-9 equivalent of F42.9?

Under the General Equivalence Mappings, obsessive-compulsive disorder, unspecified converts to ICD-9-CM 300.3 (obsessive-compulsive dis). The mapping is approximate, so confirm the match fits the documentation.

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.