ICD-10 Code F18 – Inhalant related disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F18 – Inhalant related disorders
What it is
F18 identifies disorders caused by inhaling volatile substances for their psychoactive effects. Use it when the record documents inhalant misuse, dependence, intoxication, or related mental and behavioral disturbance.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include recent inhalant use, intoxication, impaired judgment, mood or behavior changes, and evidence of harmful use or dependence.
When to use this code
Use F18 when the provider diagnoses an inhalant-related disorder and does not specify a more detailed subcategory. Apply it to encounters documenting abuse, dependence, intoxication, or other inhalant-related mental and behavioral conditions. Check documentation for the exact substance and clinical state.
Do not use for
Do not use F18 for tobacco, alcohol, or non-inhaled substance disorders. If the chart only notes exposure, poisoning, or adverse effects without a diagnosed inhalant-related disorder, choose the appropriate code instead.
Coding tip
Verify the provider’s wording and the substance involved before assigning F18.