Underdosing of amphetamines, subsequent encounter

This code indicates that a patient is experiencing adverse effects or complications due to taking less than the prescribed or recommended amount of an amphetamine-type stimulant. This underdosing is occurring during a subsequent encounter for the same condition, meaning the patient is receiving ongoing care for the sequelae of the initial underdosing event.

Use this code when a patient presents for follow-up care related to insufficient intake of an amphetamine, such as for ADHD medication or narcolepsy treatment, and is experiencing symptoms of undertreatment or withdrawal. This applies to situations where the patient intentionally or unintentionally took less than prescribed, leading to a recurrence of symptoms or new complications.

• This "D" encounter character signifies ongoing treatment for the underdosing event, not the initial presentation.
• Always code the specific manifestation of the underdosing (e.g., recurrence of ADHD symptoms, withdrawal syndrome) as a primary diagnosis if applicable.
• Distinguish carefully between underdosing (taking too little) and noncompliance (not taking the medication at all), as different codes apply.