ICD-10 Code F34.9 – Persistent mood [affective] disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F34.9 – Persistent mood [affective] disorder, unspecified
What it is
This code identifies a persistent mood disorder when the specific subtype is not documented. Use it for long-lasting affective symptoms that do not fit a more precise coded diagnosis.
Clinical signs
Clinical features vary; refer to documentation. You may see chronic low mood, reduced interest, or other ongoing mood disturbance, but the record should support a persistent affective condition.
When to use this code
Use F34.9 when the clinician documents a persistent mood disorder but does not specify dysthymia, cyclothymia, or another subtype. It is also appropriate when the chart supports a chronic affective disorder, yet the exact form is unclear.
Choose this code only after reviewing the note for a more specific diagnosis. If the provider later clarifies the condition, update the code to the documented subtype.
Do not use for
Do not use it for major depressive disorder, bipolar disorder, or an acute mood episode. Check documentation if the record names a more specific persistent mood disorder.
Coding tip
Search the assessment and problem list for a documented subtype before defaulting to F34.9.