Poisoning by tetracyclic antidepressants, accidental, subs

This code signifies an accidental overdose or adverse reaction to a tetracyclic antidepressant during a follow-up visit. The patient has previously received initial treatment for the poisoning and is now being seen for ongoing management, monitoring, or complications.

Use this code for subsequent encounters where a patient is being treated for the lingering effects or complications of an unintentional poisoning by a tetracyclic antidepressant. This includes follow-up appointments for organ damage assessment, psychiatric evaluation post-overdose, or management of persistent side effects.

• Requires an external cause code (e.g., X42) to fully describe the circumstances of the poisoning.
• The 7th character "D" indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.
• Do not use for initial treatment of the poisoning; that would require a 7th character "A".