ICD-10 Code F18.959 – Inhalant use, unspecified with inhalant-induced psychotic disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F18.959 – Inhalant use, unspecified with inhalant-induced psychotic disorder, unspecified
What it is
This code identifies unspecified inhalant use when the person also has a psychotic disorder caused by inhalant use. Use it when the record links inhalant exposure to hallucinations, delusions, or other psychotic symptoms, but does not specify the substance or psychosis type.
Clinical signs
Clinical features vary; refer to documentation. Common findings include hallucinations, delusions, disorganized thinking, or marked behavioral disturbance occurring in the setting of inhalant use.
When to use this code
Use this code when the provider documents inhalant use and an inhalant-induced psychotic disorder, but the inhalant is not named and the psychosis is not further specified. It also fits cases where the note states “unspecified” for both the use pattern and the psychotic disorder. Check documentation for the causal relationship.
Do not use for
Do not use it when psychotic symptoms are unrelated to inhalant use or when a more specific inhalant-related diagnosis is documented. Do not assign it if the record only mentions intoxication, dependence, or abuse without psychosis.
Coding tip
Confirm that the provider explicitly connects the psychosis to inhalant use before assigning F18.959.