Hallucinogen use, unsp with intoxication with delirium

This diagnosis code indicates a pattern of problematic hallucinogen use where the specific type of hallucinogen is not documented. The patient is experiencing acute intoxication, characterized by physiological and psychological effects of the substance, and also exhibits delirium, a severe disturbance in mental abilities that results in confused thinking and reduced awareness of the environment.

This code is appropriate for patients presenting with acute hallucinogen intoxication and delirium, where the specific hallucinogen cannot be identified from the medical record. Documentation should clearly support both the hallucinogen use and the presence of delirium as a direct consequence of the intoxication. This code is often used in emergency department or inpatient settings for acute presentations.

• Ensure documentation explicitly states "delirium" in the context of intoxication. Do not assume delirium from general confusion.
• If the specific hallucinogen is known (e.g., LSD, PCP), a more specific F16.xx code should be used.
• Sequence this code as the primary diagnosis if the hallucinogen use with intoxication and delirium is the reason for the encounter.