ICD-10 Code F16.1 – Hallucinogen abuse (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F16.1 – Hallucinogen abuse
What it is
F16.1 identifies abuse of hallucinogens, meaning a pattern of use that causes harm or impairment but does not necessarily meet criteria for dependence. Use this code when the record clearly documents hallucinogen abuse.
Clinical signs
Clinical features vary; refer to documentation. Notes may describe repeated misuse, intoxication-related behavior, impaired judgment, or problems at work, school, or home linked to hallucinogen use.
When to use this code
Use F16.1 when the clinician documents hallucinogen abuse, misuse, or harmful use and the substance is a hallucinogen. Apply it when the record supports abuse without a diagnosis of dependence or a more specific hallucinogen-related disorder. Check documentation if the substance type is unclear.
Do not use for
Do not use this code for hallucinogen dependence, intoxication, or other substance use disorders unless abuse is specifically documented. If the record only says “drug use” or is nonspecific, check documentation.
Coding tip
Confirm the substance class and the provider’s wording before assigning F16.1; “abuse” must be documented or clearly supported.