2026 ICD-10-CM Diagnosis Code F98.9Unspecified behavioral and emotional disorders with onset usually occurring in childhood and adolescence

ICD-10-CM Codes›F01–F99›F90-F98›F98

ICD-10-CM F98.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F98.9 is a billable ICD-10-CM diagnosis code for unspecified behavioral and emotional disorders with onset usually occurring in childhood and adolescence. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Miscellaneous mental and behavioral disorders/conditions.

Code Identity

ICD-10-CM Code
F98.9
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified behavioral and emotional disorders with onset usually occurring in childhood and adolescence
Short Description
Unsp behav/emotn disord w onst usly occur in chldhd and adol
Parent Code
F98
Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF90-F98Behavioral and emotional disorders with onset usually occurring in childhood and adolescence
CategoryF98Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence
This CodeF98.9Unspecified behavioral and emotional disorders with onset usually occurring in childhood and adolescence

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adolescent behavior alteration
  • Axis II diagnosis
  • Axis V diagnosis
  • Behavioral and emotional disorder with onset in childhood
  • Childhood disorder of conduct and emotion
  • Chronic mental disorder
  • Conduct disorder, childhood-onset type
  • Deferred diagnosis on Axis II
  • Hypersomnia disorder related to another mental disorder
  • Insomnia disorder related to another mental disorder
  • Mental disorder
  • Mental disorder in adolescence
  • Mental disorder in childhood
  • On severe mental illness register
  • Psychiatric behavioral disability
  • Psychiatric treatment changed
  • Psychiatric treatment started

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)
      • mental (or behavioral) (nonpsychotic)
        • infancy, childhood or adolescence
    • Disturbance(s)
      • habit, child
    • Habit, habituation
      • disturbance, child

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

Patient EducationClinical

Child Behavior Disorders

All kids misbehave some times. And some may have temporary behavior problems due to stress. For example, the birth of a sibling, a divorce, or a death in the family may cause a child to act out. Behavior disorders are more serious. They involve a pattern of hostile, aggressive, or disruptive behaviors for more than 6 months.

Read the full article at MedlinePlus

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

Convert F98.9 to ICD-9-CMHistory

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

ICD-9-CM
313.9 Emotional dis child 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 F98.9Overview

Is F98.9 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified behavioral and emotional disorders with onset usually occurring in childhood and adolescence on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of F98.9?

Under the General Equivalence Mappings, unspecified behavioral and emotional disorders with onset usually occurring in childhood and adolescence converts to ICD-9-CM 313.9 (emotional dis child 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.