2026 ICD-10-CM Diagnosis Code F33.9Major depressive disorder, recurrent, unspecified

ICD-10-CM Codes›F01–F99›F30-F39›F33

ICD-10-CM F33.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F33.9 is a billable ICD-10-CM diagnosis code for major depressive disorder, recurrent, 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 Depressive disorders.

Code Identity

ICD-10-CM Code
F33.9
Billable Status
Yes — Valid for Submission
Code Describes
Major depressive disorder, recurrent, unspecified
Short Description
Major depressive disorder, recurrent, unspecified
Same as the full description in the CMS dataset.
Parent Code
F33
Major depressive disorder, recurrent

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF30-F39Mood [affective] disorders
CategoryF33Major depressive disorder, recurrent
This CodeF33.9Major depressive disorder, recurrent, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic depression
  • Chronic recurrent major depressive disorder
  • Minimal major depression
  • Minimal recurrent major depression
  • Moderately severe recurrent major depression
  • Postpartum depression
  • Recurrent major depression
  • Recurrent major depressive disorder with melancholic features
  • Recurrent major depressive disorder with postpartum onset
  • Recurrent major depressive episodes
  • Seasonal affective disorder

Tabular List NotesGuidance

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

Inclusion Terms

  • Monopolar depression 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.

    • Depression(acute) (mental)
      • monopolar
    • Disorder(of)
      • depressive
        • major
          • recurrent
    • Disorder(of)
      • depressive
        • recurrent
    • Episode
      • depressive
        • recurrent
    • Involution, involutional
      • depression (single episode)
        • recurrent episode
    • Melancholia
      • recurrent
    • Menopause, menopausal(asymptomatic) (state)
      • depression (single episode)
        • agitated (single episode)
          • recurrent episode
    • Menopause, menopausal(asymptomatic) (state)
      • depression (single episode)
        • psychotic (single episode)
          • recurrent episode
    • Reaction
      • depressive (single episode)
        • affective (single episode)
          • recurrent episode

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

  • Seasonal Affective Disorder

    a syndrome characterized by depressions that recur annually at the same time each year, usually during the winter months. other symptoms include anxiety, irritability, decreased energy, increased appetite (carbohydrate cravings), increased duration of sleep, and weight gain. sad (seasonal affective disorder) can be treated by daily exposure to bright artificial lights (phototherapy), during the season of recurrence.

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 F33.9 to ICD-9-CMHistory

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

ICD-9-CM
296.30 Recurr depr psychos-unsp
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 F33.9Overview

Is F33.9 (Major depressive disorder, recurrent) a billable code?

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

What is the ICD-9 equivalent of F33.9?

Under the General Equivalence Mappings, major depressive disorder, recurrent, unspecified converts to ICD-9-CM 296.30 (recurr depr psychos-unsp). 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.