ICD-10 Code F28 – Other psychotic disorder not due to a substance or known physiological condition (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F28 – Other psychotic disorder not due to a substance or known physiological condition
What it is
F28 identifies a psychotic disorder with symptoms such as delusions or hallucinations that do not fit a more specific psychotic diagnosis and are not caused by substances or a known medical condition.
Clinical signs
Clinical features vary; refer to documentation. Common findings include fixed false beliefs, hallucinations, disorganized thought, or impaired reality testing when the presentation does not meet criteria for a named psychotic disorder.
When to use this code
Use F28 when the provider documents an other specified psychotic disorder and rules out substance-induced or physiologic causes. It may apply when psychotic symptoms are present but the record does not support schizophrenia, schizoaffective disorder, or a brief psychotic disorder.
Code the diagnosis only when the documentation clearly supports a nonorganic psychotic condition. If the note is vague, check documentation for the exact psychiatric diagnosis and any excluded causes.
Do not use for
Do not use this code for psychosis due to drugs, alcohol, or a medical condition. Also avoid it when the record supports a more specific psychotic disorder.
Coding tip
Confirm that the provider has excluded substance-related and medical causes before assigning F28.