Underdosing of systemic anti-infect/parasit, subs

This code indicates that a patient has experienced an adverse effect due to receiving an insufficient amount of a systemic anti-infective or antiparasitic medication, other than those specifically classified elsewhere. This underdosing has led to a negative clinical outcome or a failure to achieve the intended therapeutic effect. The "D" in the seventh character signifies that this is a subsequent encounter for the underdosing event, meaning the patient is receiving follow-up care for the initial problem.

Use this code when documenting a patient's follow-up visit or continued care for complications arising from an inadequate dosage of a systemic anti-infective or antiparasitic. This could include situations where an infection has not resolved, has worsened, or new symptoms have emerged because the initial or ongoing medication regimen was insufficient. It is appropriate for scenarios where the underdosing was identified and is now being managed or monitored.

• Always sequence this code after the code(s) for the specific condition being treated (e.g., the infection) that was not adequately managed due to the underdosing.
• Ensure the medical record clearly documents the underdosing event, the specific medication involved, and the resulting clinical consequences.
• Verify that the encounter is indeed a "subsequent encounter" for the underdosing, as opposed to an initial encounter (A) or sequela (S).