ICD-10: F16.121

The ICD-10 code F16.121 refers specifically to "Hallucinogen abuse with intoxication with delirium." Here are some alternative names and related terms that may be associated with this diagnosis:

• Hallucinogen Intoxication: This term refers to the state of being under the influence of hallucinogenic substances, which can lead to altered perceptions and experiences.
• Hallucinogen-Induced Delirium: This phrase emphasizes the delirium aspect that can occur as a result of hallucinogen use.
• Psychedelic Substance Abuse: A broader term that encompasses the misuse of substances that induce hallucinations, including LSD, psilocybin, and others.
• Substance-Induced Psychotic Disorder: This term can be used when hallucinogens lead to severe psychological symptoms, including delirium.
• Hallucinogen Use Disorder: This term describes a pattern of hallucinogen use that leads to significant impairment or distress.

These terms reflect various aspects of the condition and its implications in clinical practice. They can be useful for understanding the broader context of hallucinogen-related disorders and their effects on mental health.

The diagnosis for ICD-10 code F16.121, which refers to "Hallucinogen abuse with intoxication with delirium," is based on specific criteria that align with the definitions of substance use disorders and the symptoms of delirium. Here are the key criteria typically considered for this diagnosis:

• Substance Use: The individual must have a history of hallucinogen use, which includes substances that can cause alterations in perception, mood, and cognitive processes.

• Intoxication Symptoms: The diagnosis requires evidence of intoxication, which may manifest as perceptual disturbances, mood changes, and cognitive impairment. Symptoms can include hallucinations, altered sense of time, and emotional instability.

• Delirium: The presence of delirium is a critical component. This is characterized by a disturbance in attention and awareness, which develops over a short period and represents a change from baseline attention and cognition. Symptoms may include confusion, disorientation, and fluctuating levels of consciousness.

• Exclusion of Other Causes: The symptoms must not be better explained by another medical condition or mental disorder. This means that the delirium should not be attributable to other factors such as infections, metabolic imbalances, or other substance use.

• Impact on Functioning: The symptoms must cause clinically significant distress or impairment in social, occupational, or other important areas of functioning.

These criteria ensure that the diagnosis is specific to hallucinogen abuse accompanied by intoxication and delirium, distinguishing it from other substance-related disorders and mental health conditions [1][4][5].