ICD-10 Code F29 – Unspecified psychosis not due to a substance or known physiological condition (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F29 – Unspecified psychosis not due to a substance or known physiological condition
What it is
Use this code for a psychotic disorder when the record shows psychosis but does not identify a substance cause or a known medical condition. It is the unspecified option when documentation is limited.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include delusions, hallucinations, disorganized thinking, or markedly impaired reality testing.
When to use this code
Assign F29 when the provider documents psychosis and does not specify schizophrenia, mood disorder with psychotic features, substance-induced psychosis, or psychosis due to a medical condition. Use it only when the chart supports psychosis but the cause remains unclear. Check documentation if the diagnosis is more specific.
Do not use for
Do not use this code for psychosis clearly linked to drugs, alcohol, or a known physiological condition. Also avoid it when a more specific psychotic disorder is documented.
Coding tip
Verify the provider’s final diagnosis and code the most specific psychotic disorder documented.