ICD-10 Code F34.1 – Dysthymic Disorder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F34.1 – Dysthymic disorder
What it is
Dysthymic disorder, also called persistent depressive disorder, is a long-lasting mood condition with chronic low mood. You use this code when documentation describes a persistent depressive state rather than a single major depressive episode.
Clinical signs
Common features include depressed mood, low energy, poor self-esteem, and reduced interest or pleasure. Clinical features vary; refer to documentation.
When to use this code
Use F34.1 when the record clearly documents dysthymia or persistent depressive disorder. Assign it for chronic depressive symptoms that meet the provider’s diagnosis, even if the note does not describe an acute major episode. Check documentation if the terminology is unclear.
Do not use for
Do not use this code for a brief depressive reaction or for a documented major depressive disorder alone. If the provider records another mood disorder or the diagnosis is uncertain, check documentation.
Coding tip
Look for the exact wording “dysthymic disorder” or “persistent depressive disorder” in the assessment before assigning F34.1.