Underdosing of other psychodysleptics, initial encounter

This code signifies a patient experiencing adverse effects or complications due to taking less than the prescribed or recommended amount of a hallucinogenic substance. This underdosing can lead to a lack of therapeutic effect, worsening of the underlying condition, or withdrawal symptoms.

Use this code when documenting a patient presenting for treatment because they did not take enough of a hallucinogen, either intentionally or unintentionally, and are experiencing related health issues. This includes situations where a patient self-adjusts their dosage downward or forgets to take a dose.

• Ensure documentation clearly states "underdosing" and specifies the substance as a hallucinogen.
• The "A" seventh character indicates an initial encounter for this specific underdosing event.
• Always code any associated signs, symptoms, or conditions resulting from the underdosing.