Underdosing of oth parasympatholytics and spasmolytics, subs

This code signifies a patient experiencing adverse effects due to receiving an insufficient dose of a parasympatholytic medication, such as an anticholinergic or antimuscarinic, or a spasmolytic agent. This underdosing has led to a recurrence or persistence of the condition the medication was intended to treat. The encounter documented is not the initial treatment for the underdosing.

Use this code when a patient presents for follow-up care related to symptoms or conditions that have worsened or not improved because their prescribed anticholinergic, antimuscarinic, or spasmolytic medication dose was too low. This applies to situations where the underdosing has been previously identified and is being managed. Examples include persistent bladder spasms due to insufficient oxybutynin or ongoing Parkinsonian tremors due to inadequate benztropine.

• Requires an external cause code (Y90-Y99) to specify the circumstances of the underdosing.
• Always sequence this code after the code(s) for the specific adverse effect or condition being treated.
• Confirm the encounter is not the initial presentation for the underdosing; "D" indicates a subsequent encounter.