ICD-10 Code F16.90 – Hallucinogen use, unspecified, uncomplicated (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F16.90 – Hallucinogen use, unspecified, uncomplicated
What it is
F16.90 identifies hallucinogen use when the substance is not specified and no complication is documented. Use it for a general diagnosis of hallucinogen use without evidence of intoxication, dependence, withdrawal, or another coded disorder.
Clinical signs
Clinical features vary; refer to documentation. Hallucinogen use may be associated with altered perception, mood changes, or behavioral changes, but this code itself does not require a documented symptom pattern.
When to use this code
Use F16.90 when the record documents hallucinogen use, but the substance is not named and no further detail is available. It also fits brief encounters where the clinician notes use history without specifying intoxication or other complications.
Do not infer a more specific hallucinogen or a related disorder unless the documentation supports it. If the chart is unclear, check documentation before assigning a code.
Do not use for
Do not use this code for hallucinogen intoxication, dependence, abuse, or withdrawal when those conditions are documented. Also avoid it when a specific hallucinogen is named and a more specific code is supported.
Coding tip
Query for the exact substance and any complication before defaulting to F16.90.