2026 ICD-10-CM Diagnosis Code F48.9Nonpsychotic mental disorder, unspecified

ICD-10-CM Codes›F01–F99›F40-F48›F48

ICD-10-CM F48.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F48.9 is a billable ICD-10-CM diagnosis code for nonpsychotic mental 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 high level of neuroticism. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Miscellaneous mental and behavioral disorders/conditions.

Code Identity

ICD-10-CM Code
F48.9
Billable Status
Yes — Valid for Submission
Code Describes
Nonpsychotic mental disorder, unspecified
Short Description
Nonpsychotic mental disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
F48
Other nonpsychotic mental disorders

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF40-F48Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders
CategoryF48Other nonpsychotic mental disorders
This CodeF48.9Nonpsychotic mental disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • High level of neuroticism
  • Impaired judgement
  • Intellectual faculties - finding
  • Level of neuroticism - finding
  • Mental health problem
  • Neurosis
  • Neurotic condition, insight present
  • Poor insight into neurotic condition
  • Tension

Tabular List NotesGuidance

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

Inclusion Terms

  • Neurosis NOS

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)
      • neurotic
    • Neurosis, neurotic
    • Neurosis, neurotic
      • state
    • Problem(with) (related to)
      • mental
    • Reaction
      • neurotic
    • State(of)
      • neurotic
    • State(of)
      • tension (mental)
    • Tension
      • state (mental)
    • Upset
      • mental

Clinical ClassificationClinical

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

CCSR MBD013
Miscellaneous mental and behavioral disorders/conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Aponeurosis

    a flat, tendon-like membrane that serves to bind muscles or to attach muscles to bones.

  • Neurosis

    a form of functional mental illness that manifests in distressed emotional reactions such as anxiety, obsessive thoughts, compulsive behaviors, or irrational fears.

  • Post-Traumatic Stress Disorder|Combat Neurosis|PTSD|PTSD|post-traumatic stress disorder

    an anxiety disorder precipitated by an experience of intense fear or horror while exposed to a traumatic (especially life-threatening) event. the disorder is characterized by intrusive recurring thoughts or images of the traumatic event; avoidance of anything associated with the event; a state of hyperarousal and diminished emotional responsiveness. these symptoms are present for at least one month and the disorder is usually long-term.

Patient EducationClinical

Mental Disorders

Mental disorders (or mental illnesses) are conditions that affect your thinking, feeling, mood, and behavior. They may happen over a short period of time or come and go. Some can be chronic (long-lasting). They can affect your ability to relate to others and function each day..

The full article covers:

  • What are mental disorders?
  • What are some types of mental disorders?
  • What causes mental disorders?
  • Who is at risk for mental disorders?
  • How are mental disorders diagnosed?
  • What are the treatments for mental disorders?

Read the full article at MedlinePlus

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

Convert F48.9 to ICD-9-CMHistory

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

ICD-9-CM
300.9 Nonpsychotic disord NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
V40.2 Mental problems NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
V40.9 Mental/behavior prob NOS
Approximate The match is approximate rather than exact.

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 F48.9Overview

Is F48.9 (Other nonpsychotic mental disorders) a billable code?

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

What is the ICD-9 equivalent of F48.9?

Under the General Equivalence Mappings, nonpsychotic mental disorder, unspecified converts to ICD-9-CM 300.9 (nonpsychotic disord NOS), V40.2 (mental problems NEC), and V40.9 (mental/behavior prob NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.