2026 ICD-10-CM Diagnosis Code F34.1Dysthymic disorder

ICD-10-CM Codes›F01–F99›F30-F39›F34

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

F34.1 is a billable ICD-10-CM diagnosis code for dysthymic disorder. 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 Depressive disorders.

Code Identity

ICD-10-CM Code
F34.1
Billable Status
Yes — Valid for Submission
Code Describes
Dysthymic disorder
Short Description
Dysthymic disorder
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 CodeF34.1Dysthymic disorder

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Dysthymia
  • Early onset dysthymia
  • Hypomanic personality disorder
  • Late onset dysthymia
  • Lifelong depressive personality trait
  • Primary dysthymia
  • Primary dysthymia early onset
  • Primary dysthymia late onset
  • Secondary dysthymia
  • Secondary dysthymia early onset
  • Secondary dysthymia late onset

Tabular List NotesGuidance

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

Inclusion Terms

  • Depressive neurosis
  • Depressive personality disorder
  • Dysthymia
  • Neurotic depression
  • Persistent anxiety depression
  • Persistent depressive disorder

Type 2 Excludes

  • anxiety depression mild or not persistent F41.8

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.

    • Depression(acute) (mental)
      • anxiety
        • persistent
    • Depression(acute) (mental)
      • nervous
    • Depression(acute) (mental)
      • neurotic
    • Depression(acute) (mental)
      • psychoneurotic
    • Disorder(of)
      • depressive
        • persistent
    • Disorder(of)
      • dysthymic
    • Disorder(of)
      • mood
        • persistent
          • dysthymia
    • Disorder(of)
      • personality
        • depressive
    • Disorder(of)
      • personality
        • hypothymic
    • Dysthymia
    • Neurosis, neurotic
      • depressive (reaction) (type)
    • Personality(disorder)
      • depressive
    • Personality(disorder)
      • hypothymic
    • Reaction
      • depressive (single episode)
        • neurotic
    • Reaction
      • depressive (single episode)
        • psychoneurotic
    • Reaction
      • neurotic-depressive
    • Reaction
      • psychoneurotic
        • depressive
    • State(of)
      • depressive
        • neurotic

Clinical ClassificationClinical

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

CCSR MBD002
Depressive disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Dysthymic Disorder

    chronically depressed mood that occurs for most of the day more days than not for at least 2 years. the required minimum duration in children to make this diagnosis is 1 year. during periods of depressed mood, at least 2 of the following additional symptoms are present: poor appetite or overeating, insomnia or hypersomnia, low energy or fatigue, low self-esteem, poor concentration or difficulty making decisions, and feelings of hopelessness. (dsm-iv)

Patient EducationClinical

Depression

Depression is more than a feeling of being sad or irritable for a few days. It's a serious mood disorder. As one of the most common mental disorders in the United States, depression can affect how you think, feel, and your everyday life.

The full article covers:

  • What is depression?
  • What are the different types of depression?
  • What causes depression?
  • Who is at risk of depression?
  • What are the symptoms of depression?
  • How is depression diagnosed?
  • What are the treatments for depression?
  • Can depression be prevented?

Read the full article at MedlinePlus

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

Convert F34.1 to ICD-9-CMHistory

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

ICD-9-CM
300.4 Dysthymic disorder
Approximate The match is approximate rather than exact.
ICD-9-CM
301.12 Chr depressive person
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 F34.1Overview

Is F34.1 (Persistent mood [affective] disorders) a billable code?

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

What is the ICD-9 equivalent of F34.1?

Under the General Equivalence Mappings, dysthymic disorder converts to ICD-9-CM 300.4 (dysthymic disorder) and 301.12 (chr depressive person). 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.