2027 ICD-10-CM Diagnosis Code F42.9Obsessive-compulsive disorder, unspecified
ICD-10-CM Codes›F01–F99›F40-F48›F42
- Billable — Valid for Submission
- Chronic Condition
F42.9 is a billable ICD-10-CM diagnosis code for obsessive-compulsive disorder, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 882. 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.
F42.9 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
F42.9 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Obsessive compulsive disorder caused by psychoactive substance
- Obsessive-compulsive disorder
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to F42.9: its own notes plus those printed at F42 and Chapter 5. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- disorders of psychological development
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name F42.9, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming F42.9: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 4
These codes carry an Excludes2 note naming F42.9: its condition is not part of those codes, and both may be reported when the patient has both.
- F60.5 Obsessive-compulsive personality disorderobsessive-compulsive disorder (F42.-) names F42.-, which includes this code
- F98 Other behavioral and emotional disorders with onset usually occurring in childhood and adolescenceobsessive-compulsive disorder (F42.-) names F42.-, which includes this code
- F98.4 Stereotyped movement disorderscompulsions in obsessive-compulsive disorder (F42.-) names F42.-, which includes this code
- F93.0 Separation anxiety disorder of childhood
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
obsessive-compulsive F42.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Obsessive-Compulsive Disorder
an anxiety disorder characterized by recurrent, persistent obsessions or compulsions. obsessions are the intrusive ideas, thoughts, or images that are experienced as senseless or repugnant. compulsions are repetitive and seemingly purposeful behavior which the individual generally recognizes as senseless and from which the individual does not derive pleasure although it may provide a release from tension.
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.
Code History & ChangesHistory
Replacement F42.9 replaces the following previously assigned code(s):
- F42 - Obsessive-compulsive disorder
Questions About F42.9Overview
What is the ICD-10 code for obsessive-compulsive disorder, unspecified?
The ICD-10-CM code for obsessive-compulsive disorder, unspecified is F42.9 (sometimes written as F429). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
What MS-DRG does F42.9 group to?
When obsessive-compulsive disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 882 (neuroses Except Depressive), which carries a relative weight of 0.9953. Higher weights mean higher Medicare reimbursement.
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.
Does F42.9 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: F42.9 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 (Anxiety and Other Psychiatric Disorders).
