Poisoning by antimycobacterial drugs, undetermined, subs

This code signifies a poisoning event involving antimycobacterial medications where the intent (e.g., accidental, intentional self-harm, assault) cannot be determined. The patient is receiving follow-up care for the sequelae or ongoing management of this poisoning.

Apply this code when a patient presents for a subsequent visit related to an undetermined poisoning by drugs like isoniazid, rifampin, or ethambutol. This includes monitoring for adverse effects, managing organ damage, or continuing treatment initiated during the acute phase.

• Always sequence this code after the primary diagnosis for the specific condition being treated due to the poisoning.
• Ensure documentation clearly states "undetermined" intent and that the encounter is for follow-up care.
• Do not use for initial encounters; instead, select the appropriate initial encounter (A) or subsequent encounter (D) for the specific intent if known.