ICD-10 Code F16.98 – Hallucinogen use, unspecified with other specified hallucinogen-induced disorder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F16.98 – Hallucinogen use, unspecified with other specified hallucinogen-induced disorder
What it is
This code identifies hallucinogen use when the patient has another specified disorder caused by the substance, but the exact hallucinogen is not documented. Use it when the record supports hallucinogen-related harm and a more specific induced disorder.
Clinical signs
Clinical features vary; refer to documentation. You may see hallucinations, perceptual changes, anxiety, agitation, or other substance-induced psychiatric or behavioral effects linked to hallucinogen use.
When to use this code
Use this code when the clinician documents hallucinogen use and a specified induced disorder that is not otherwise classified, but does not name a particular hallucinogen. It is appropriate when the chart supports a causal relationship between the substance and the disorder. Check documentation if the induced condition is unclear or if another code better matches the recorded diagnosis.
Do not use for
Do not use this code for uncomplicated hallucinogen use without an induced disorder. Do not use it when the substance and disorder are documented more specifically elsewhere.
Coding tip
Confirm both the hallucinogen use and the exact induced disorder in the note before assigning F16.98.