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ICD-10-CM 2027 diagnosis code

F34.0Cyclothymic disorder

✓ Billable / specific

F34.0 is a valid, billable ICD-10-CM code for cyclothymic disorder. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Cyclothymia, ICD-10 code for Cycloid personality, ICD-10 code for Cyclothymic personality.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About F34.0

F34.0 is the ICD-10-CM diagnosis code for Cyclothymic disorder. It belongs to category F34 (persistent mood [affective] disorders), block F30-F39 (mood [affective] disorders) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within F34 (persistent mood [affective] disorders), F34.0 is specifically for Cyclothymic disorder. Related codes cover Dysthymic disorder (F34.1), other persistent mood [affective] disorders (F34.8) and persistent mood [affective] disorder, unspecified (F34.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 883 (Disorders of Personality and Impulse Control, relative weight 1.7697), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 301.10 (affective personality disorder, unspecified) and 301.13 (Cyclothymic disorder).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Affective personality disorder
  • Cycloid personality
  • Cyclothymia
  • Cyclothymic personality

Notes that apply from higher levels

Instructions written at a parent level also apply to F34.0.

Broader instructions also apply from Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

Alphabetic index entries

12 entries

Terms in the official ICD-10-CM index that lead to F34.0.

Codes whose notes reference F34.0

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 19 · Mental Diseases and Disorders

ICD-9-CM equivalent

Converter →
  • 301.10Affective personality disorder, unspecifiedapproximate
  • 301.13Cyclothymic disorderapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about F34.0

Is F34.0 billable?

Yes. F34.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can F34.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict F34.0 as a principal diagnosis.

Is F34.0 a CC or MCC?

No. F34.0 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does F34.0 group to?

F34.0 is used in the MS-DRG v44.0 logic for MS-DRG 883 (Disorders of Personality and Impulse Control). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for F34.0?

The CMS General Equivalence Mappings map F34.0 to ICD-9-CM 301.10 and 301.13.