ICD-10 Code F16.983 – Hallucinogen use, unspecified with hallucinogen persisting perception disorder (flashbacks) (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F16.983 – Hallucinogen use, unspecified with hallucinogen persisting perception disorder (flashbacks)
What it is
This code identifies hallucinogen use, unspecified, with persistent perception disturbances after use. It applies when a patient has flashback-like symptoms linked to prior hallucinogen exposure.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include recurrent perceptual disturbances, such as visual changes or flashbacks, after the drug effect has ended.
When to use this code
Use this code when the record states hallucinogen use and describes persisting perception disorder, including flashbacks. It is appropriate when the specific hallucinogen is not identified, but the ongoing perceptual symptoms are documented. Check documentation for substance details and timing.
Do not use for
Do not use this code for acute intoxication, simple hallucinogen use without persisting symptoms, or psychosis not linked to hallucinogen exposure. Check documentation if the cause of symptoms is unclear.
Coding tip
Confirm both the unspecified hallucinogen use and the persisting perception disorder are documented before assigning F16.983.