2026 ICD-10-CM Diagnosis Code F34.9Persistent mood [affective] disorder, unspecified

ICD-10-CM Codes›F01–F99›F30-F39›F34

ICD-10-CM F34.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F34.9 is a billable ICD-10-CM diagnosis code for persistent mood [affective] disorder, unspecified. 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 Other specified and unspecified mood disorders.

Code Identity

ICD-10-CM Code
F34.9
Billable Status
Yes — Valid for Submission
Code Describes
Persistent mood [affective] disorder, unspecified
Short Description
Persistent mood [affective] disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
F34
Persistent mood [affective] disorders

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF30-F39Mood [affective] disorders
CategoryF34Persistent mood [affective] disorders
This CodeF34.9Persistent mood [affective] disorder, unspecified

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)
      • emotional (persistent)
    • Disorder(of)
      • mood
        • persistent
    • Disorder(of)
      • persistent
        • affective (mood)

Clinical ClassificationClinical

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

CCSR MBD004
Other specified and unspecified mood disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Mood Disorders

Most people feel sad or irritable from time to time. They may say they're in a bad mood. A mood disorder is different. It affects a person's everyday emotional state. Nearly one in ten people aged 18 and older have mood disorders. These include depression and bipolar disorder (also called manic depression).

Read the full article at MedlinePlus

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

Convert F34.9 to ICD-9-CMHistory

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

ICD-9-CM
296.99 Episodic mood disord NEC
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 F34.9Overview

Is F34.9 (Persistent mood [affective] disorders) a billable code?

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

What is the ICD-9 equivalent of F34.9?

Under the General Equivalence Mappings, persistent mood [affective] disorder, unspecified converts to ICD-9-CM 296.99 (episodic mood disord NEC). 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.