ICD-10 Code F18.159 – Inhalant Abuse with Inhalant-Induced Psychotic Disorder, Unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F18.159 – Inhalant abuse with inhalant-induced psychotic disorder, unspecified
What it is
Use this code for inhalant abuse when the person also has an inhalant-induced psychotic disorder, but the psychotic disorder is not otherwise specified. It indicates a substance-related mental disorder tied to inhalant use.
Clinical signs
Clinical features vary; refer to documentation. Typical psychotic findings may include hallucinations, delusions, or disorganized thinking occurring in the context of inhalant use.
When to use this code
Assign this code when the provider documents inhalant abuse together with an inhalant-induced psychotic disorder and does not specify a more detailed psychotic subtype. Use the code only when the record clearly links the psychosis to inhalant use. Check documentation if the substance relationship is unclear.
Do not use for
Do not use this code for inhalant abuse without psychotic disorder, or for psychosis caused by another substance or a primary psychotic disorder. If the diagnosis is unspecified or different, verify the documented condition.
Coding tip
Make sure the chart states both inhalant abuse and the inhalant-induced psychotic disorder before assigning F18.159.