ICD-10 Code F45.1 – Undifferentiated somatoform disorder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F45.1 – Undifferentiated somatoform disorder
What it is
F45.1 identifies a somatoform disorder in which physical symptoms are present, but no single pattern fits a more specific somatoform diagnosis. You use it when the concern is persistent bodily complaints without adequate medical explanation.
Clinical signs
Clinical features vary; refer to documentation. Commonly, patients report ongoing physical symptoms, repeated medical visits, and distress focused on bodily complaints, with findings that do not support a clear organic cause.
When to use this code
Use F45.1 when the record documents undifferentiated somatoform disorder or a similar diagnosis and the clinician has ruled out a more specific somatoform condition. It may fit cases with multiple unexplained symptoms that do not meet criteria for a single named subtype. Check documentation when the provider’s wording is unclear.
Do not use for
Do not use this code for a confirmed medical disease causing the symptoms. Also avoid it when the record supports a more specific somatic symptom-related diagnosis or when documentation is insufficient.
Coding tip
Code from the provider’s exact diagnosis wording and confirm that the symptoms are not better classified elsewhere.