Disorders due to use of unknown or unspecified psychoactive substances

These categories apply in clinical situations in which it is clear that the disturbance is due to substance use but the specific substance or class of substances is unknown. As more information becomes available (e.g., laboratory results, report from a collateral informant) the diagnosis should be changed to indicate the relevant substance or substance class.

Diagnostic Categories that Apply to Unknown or Unspecified Psychoactive Substances

Following is a list of specific diagnostic categories of that apply to unknown or unspecified psychoactive substances:

• 6C4G.0 Episode of Harmful Use of Unknown or Unspecified Psychoactive Substances
• 6C4G.1 Harmful Pattern of Use of Unknown or Unspecified Psychoactive Substances
• 6C4G.2 Unknown or Unspecified Psychoactive Substance Dependence
• 6C4G.3 Intoxication Due to Unknown or Unspecified Psychoactive Substance
• 6C4G.4 Withdrawal Due to Unknown or Unspecified Psychoactive Substance
• 6C4G.5 Delirium Induced by Unknown or Unspecified Psychoactive Substance
• 6C4G.6 Psychotic Disorder Induced by Unknown or Unspecified Psychoactive Substance
• 6C4G.70 Mood Disorder Induced by Unknown or Unspecified Psychoactive Substance
• 6C4G.71 Anxiety Disorder Induced by Unknown or Unspecified Psychoactive Substance
• 6C4G.72 Obsessive-Compulsive or Related Disorder Induced by Unknown or Unspecified Psychoactive Substance
• 6C4G.73 Impulse Control Disorder Induced by Unknown or Unspecified Psychoactive Substance
• 6C4G.Y Other Specified Disorder Due to Use of Unknown or Unspecified Psychoactive Substances
• 6C4G.Z Disorder Due to Use of Unknown or Unspecified Psychoactive Substances, Unspecified

The first three diagnoses listed above (Episode of Harmful Use of Unknown or Unspecified Psychoactive Substances, Harmful Pattern of Use of Unknown or Unspecified Psychoactive Substances, and Unknown or Unspecified Psychoactive Substance Dependence) describe the pattern of unknown or unspecified psychoactive substance use. One of these three diagnoses, or Disorder Due to Use of Unknown or Unspecified Psychoactive Substances, Unspecified, for cases in which the use pattern in unknown at the time of evaluation, is considered to be the primary diagnosis. That is, one of these four diagnoses should be assigned when making a diagnosis of a Disorder Due to Unknown or Unspecified Psychoactive Substance Use.

The remaining diagnoses reflect the impact of the pattern of unknown or unspecified psychoactive substance use and are thus considered to be associated with one of the primary use pattern diagnoses. These diagnoses should therefore be assigned together with the relevant primary diagnosis. For example, 6C4G.1/ 6C4G.5 is Harmful Pattern of Use of Unknown or Unspecified Psychoactive Substances associated with Unknown or Unspecified Psychoactive Substance-Induced Psychotic Disorder, 6C4G.2/6C4G.70 is Unknown or Unspecified Psychoactive Substance Dependence associated with Unknown or Unspecified Psychoactive Substance-Induced Mood Disorder, 6C4Z/6C4G.3 is Disorders Due to Substance Use, Unspecified associated with Unknown or Unspecified Psychoactive Substance Intoxication (i.e., the pattern of use in this last case is unknown).

Unknown or Unspecified Psychoactive Substance-Induced Mental Disorders are characterized by psychological, cognitive, or behavioural symptoms that develop during or soon after unknown or unspecified psychoactive substance intoxication or withdrawal or use or discontinuation of a psychoactive medication. The duration or severity of the symptoms is substantially in excess of the characteristic syndrome of Unknown or Unspecified Psychoactive Substance Intoxication or Unknown or Unspecified Psychoactive Substance Withdrawal.