ICD-10 Code F16.959 – Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F16.959 – Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified
What it is
This code identifies hallucinogen use, without specifying the substance, when the patient also has a hallucinogen-induced psychotic disorder. It indicates psychotic symptoms are linked to hallucinogen use, but the exact clinical subtype is not specified.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include hallucinations, delusions, disorganized thinking, or marked behavioral disturbance occurring in the setting of hallucinogen use.
When to use this code
Use this code when the record documents hallucinogen use and a psychotic disorder caused by that use, but does not name the specific hallucinogen. It also fits when the psychotic presentation is documented as unspecified. Do not code it from suspicion alone.
Do not use for
Do not use this code for uncomplicated hallucinogen use without psychosis. If the substance or psychotic disorder is more specifically documented, choose the more specific code. Check documentation.
Coding tip
Verify both the hallucinogen use and the induced psychotic disorder are documented before assigning F16.959.