Poisoning by antiviral drugs, assault, initial encounter

This code signifies a patient presenting with adverse effects or toxicity due to an antiviral medication, where the administration was intentionally harmful by another party. The patient is in the acute phase of treatment for this poisoning.

Apply this code when documentation clearly indicates poisoning from an antiviral drug, such as acyclovir or oseltamivir, and the circumstances point to an assault. This is appropriate for the initial visit or encounter where the poisoning is being evaluated and treated.

• Always sequence this code first when it represents the primary reason for the encounter.
• Requires external cause codes (e.g., Y09.-) to fully describe the assault.
• Do not use for accidental overdose or therapeutic misadventures.