Underdosing of unspecified psychodysleptics, subs

This code indicates that a patient has experienced an underdosing of an unspecified hallucinogenic substance, and this encounter is for follow-up care or a subsequent phase of treatment. Underdosing implies the patient took less than the prescribed or intended amount, leading to a recurrence of symptoms or insufficient therapeutic effect.

Use this code when documenting a patient's return visit for ongoing management of a condition that was inadequately treated due to insufficient intake of an unspecified hallucinogen. This could include scenarios where the patient is experiencing a return of psychiatric symptoms because they did not take enough of a prescribed hallucinogen (if applicable) or a recreational user did not take enough to achieve the desired effect, leading to continued issues.

• Ensure documentation clearly specifies "underdosing" and identifies the substance as an unspecified hallucinogen.
• The "D" seventh character signifies a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.
• Always code the specific mental or behavioral disorder being treated or managed due to the underdosing as a primary diagnosis, if applicable.