Underdosing of systemic anti-infect/parasit, init

This code signifies a patient's adverse reaction or complication arising from taking less than the prescribed or recommended dose of a systemic anti-infective or antiparasitic medication, excluding those with more specific underdosing codes. This could lead to treatment failure, worsening infection, or development of drug resistance.

Apply this code when documentation indicates a patient intentionally or unintentionally took an insufficient amount of a systemic anti-infective or antiparasitic, and this underdosing is the reason for the current encounter. This is appropriate for the initial assessment and treatment of the consequences of such underdosing.

• Always sequence this code after the code for the specific medical condition being treated or the adverse effect resulting from the underdosing.
• Ensure the documentation clearly specifies "underdosing" and identifies the medication as a systemic anti-infective or antiparasitic not covered by a more specific T37 code.
• Verify that this is indeed the "initial encounter" for the underdosing event and its direct consequences.