F34.0
Cyclothymic disorder
F34.0 (also written F340) is a billable ICD-10-CM diagnosis code for cyclothymic disorder. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 5 codes in category F34 (Persistent mood [affective] disorders). The Alphabetic Index lists it under 12 entries. Its coding notes include 1 Excludes2 entry.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Behavioral Health clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026IPF Primary
IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:
| MS-DRG | Description | Factor |
|---|---|---|
| 883 | Disorders of personality & impulse control | 1.17 |
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- disorders of psychological development
Inclusion terms
Conditions classified to this code.
- Affective personality disorder
- Cycloid personality
- Cyclothymia
- Cyclothymic personality
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 12 entries
- Cycloid personality
- Cyclothymia
- Cyclothymic personality
- Disorder (of), cyclothymic
- Disorder (of), mood, persistent, cyclothymia
- Disorder (of), personality, affective
- Disorder (of), personality, cyclothymic
- Disorder (of), personality, hyperthymic
- Personality (disorder), affective
- Personality (disorder), cycloid
- Personality (disorder), cyclothymic
- Personality (disorder), hyperthymic