FY2027 ICD-10-CM reference
F34.0: Cyclothymic disorder
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Cyclothymic disorder. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Includes
disorders of psychological development
Source: F01-F99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Source: F01-F99 (chapter, inherited).
Instructional note
Affective personality disorder
Source: F34.0 (self, direct).
Instructional note
Cycloid personality
Source: F34.0 (self, direct).
Instructional note
Cyclothymia
Source: F34.0 (self, direct).
Instructional note
Cyclothymic personality
Source: F34.0 (self, direct).
Compare the FY2027 additions, removals and billable-status changes
What does F34.0 mean in FY2027?
The official ICD-10-CM descriptor is Cyclothymic disorder. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is F34.0 billable in FY2027?
The FY2027 order file marks F34.0 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does F34.0 map to an HCC?
F34.0 has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition