Underdosing of oth parasympatholytics and spasmolytics, init

This code signifies a patient's condition resulting from taking less than the prescribed or recommended dose of an anticholinergic, antimuscarinic, or spasmolytic medication. This underdosing leads to a recurrence or worsening of the symptoms the medication was intended to treat, due to insufficient therapeutic effect.

Apply this code when a patient presents with symptoms or conditions that are exacerbated because they did not take enough of their prescribed anticholinergic, antimuscarinic, or spasmolytic drug. This is for the initial visit where the underdosing is identified and managed. Examples include worsening irritable bowel syndrome due to insufficient dicyclomine, or uncontrolled bladder spasms from inadequate oxybutynin.

• Always assign an additional code for the specific symptoms or condition that recurred or worsened due to the underdosing.
• Ensure the encounter is the "initial encounter" for the underdosing event, as indicated by the 7th character 'A'.
• Distinguish from noncompliance (Z91.12-) if the underdosing is due to patient's decision rather than an error or misunderstanding.