Underdosing of methamphetamines, initial encounter

This code signifies a patient experiencing adverse effects or a lack of therapeutic effect due to taking less than the prescribed or intended dose of a methamphetamine. This could lead to a recurrence of symptoms the medication was meant to treat or the development of withdrawal symptoms. It indicates that the patient is in the acute phase of managing this underdosing event.

Apply this code when a patient presents to an emergency department, clinic, or hospital with symptoms directly attributable to insufficient methamphetamine intake. This includes situations where a patient intentionally or unintentionally takes too little of the drug, leading to a return of underlying conditions or withdrawal. It is appropriate for the initial assessment and treatment of the underdosing.

• Always assign an additional code for the specific manifestation of the underdosing (e.g., withdrawal symptoms, recurrence of mental health condition).
• Ensure documentation clearly states "underdosing" and specifies methamphetamine as the substance involved.
• This "initial encounter" seventh character is used for the period when the patient is receiving active treatment for the underdosing.