Underdosing of penicillins, subsequent encounter

This code indicates that a patient has experienced an adverse health effect due to taking less penicillin than prescribed or recommended, and this is not the initial encounter for this specific underdosing event. It signifies a follow-up visit where the underdosing of penicillin is still a relevant clinical issue impacting the patient's care.

Use this code when a patient presents for follow-up care related to a previously identified underdosing of penicillin, such as for a persistent infection due to inadequate antibiotic levels or for monitoring the effects of the underdosing. It is appropriate for subsequent visits after the initial diagnosis of underdosing has been made.

• Always assign an additional code for the specific condition or disease being treated or that resulted from the underdosing.
• Ensure this code is used only for subsequent encounters, not the initial presentation of the underdosing.
• Distinguish carefully between underdosing (taking less than prescribed) and noncompliance (not taking at all).