2027 ICD-10-CM Diagnosis Code F34.0Cyclothymic disorder

ICD-10-CM Codes›F01–F99›F30-F39›F34

ICD-10-CM F34.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

F34.0 is a billable ICD-10-CM diagnosis code for cyclothymic disorder. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 883. Coders also document this condition as character trait finding of affective stability. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bipolar and related disorders.

F34.0 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 132 for payment year 2027.

Code Identity

ICD-10-CM Code
F34.0
Billable Status
Yes — Valid for Submission
Code Describes
Cyclothymic disorder
Short Description
Cyclothymic 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 CodeF34.0Cyclothymic disorder

Medicare Risk Adjustment (HCC)Billing

F34.0 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 132 — Depression
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Character trait finding of affective stability
  • Cyclothymia
  • Cyclothymia in remission
  • Hypomanic personality trait
  • Trait affective instability

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F34.0: its own notes plus those printed at Chapter 5. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Affective personality disorder
  • Cycloid personality
  • Cyclothymia
  • Cyclothymic personality

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F34.0, its category, or a range that includes it.

Excludes2 5

These codes carry an Excludes2 note naming F34.0: its condition is not part of those codes, and both may be reported when the patient has both.

  • F31 Bipolar disorder
    cyclothymia (F34.0)
  • F06.3 Mood disorder due to known physiological condition
    mood disorders, not due to known physiological condition or unspecified (F30-F39) names F30-F39, which includes this code
  • F90 Attention-deficit hyperactivity disorders
    mood [affective] disorders (F30-F39) names F30-F39, which includes this code
  • F91 Conduct disorders
    mood [affective] disorders (F30-F39) names F30-F39, which includes this code
  • F93.0 Separation anxiety disorder of childhood
    mood [affective] disorders (F30-F39) names F30-F39, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR MBD003
Bipolar and related disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Cyclothymic Disorder

    an affective disorder characterized by periods of depression and hypomania. these may be separated by periods of normal mood.

Patient EducationClinical

Bipolar Disorder

Bipolar disorder is a mood disorder that can cause intense mood swings:

The full article covers:

  • What is bipolar disorder?
  • What are the types of bipolar disorder?
  • What causes bipolar disorder?
  • Who is at risk for bipolar disorder?
  • What are the symptoms of bipolar disorder?
  • How is bipolar disorder diagnosed?
  • What are the treatments for bipolar disorder?

Read the full article at MedlinePlus

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

Convert F34.0 to ICD-9-CMHistory

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

ICD-9-CM
301.10 Affectiv personality NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
301.13 Cyclothymic disorder
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About F34.0Overview

What is the ICD-10 code for cyclothymic disorder?

The ICD-10-CM code for cyclothymic disorder is F34.0 (sometimes written as F340). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is F34.0 (Persistent mood [affective] disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report cyclothymic disorder on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does F34.0 group to?

When cyclothymic disorder is the principal diagnosis on an inpatient stay, it groups to MS-DRG 883 (disorders of Personality and Impulse Control), which carries a relative weight of 1.7398. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of F34.0?

Under the General Equivalence Mappings, cyclothymic disorder converts to ICD-9-CM 301.10 (affectiv personality NOS) and 301.13 (cyclothymic disorder). The mapping is approximate, so confirm the match fits the documentation.

Does F34.0 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: F34.0 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 132 (Depression).