Hallucinogen use, unspecified with intoxication, unspecified

This code signifies a patient presenting with acute intoxication due to hallucinogen use, where the specific type of hallucinogen is not documented. The intoxication manifests with behavioral or psychological changes attributable to the substance's effects on the central nervous system.

Apply this code when documentation indicates hallucinogen-induced intoxication, but the specific hallucinogen (e.g., LSD, PCP, ecstasy) is not identified. This is appropriate for emergency department visits or initial assessments where a definitive substance is yet to be determined.

• Only use when the specific hallucinogen is truly unknown or unspecified in the medical record.
• Avoid using if a more specific hallucinogen (e.g., F16.129 for LSD) is documented.
• Sequence as a primary diagnosis when the intoxication is the reason for the encounter.