Poisoning by antiallerg/antiemetic, accidental, sequela

This code signifies the long-term effects or complications arising from an accidental overdose or improper use of antiallergic or antiemetic medications. These sequelae can manifest as chronic organ damage, persistent neurological deficits, or other lasting health issues directly attributable to the initial poisoning event.

Apply this code when documenting a patient presenting with a current condition that is a direct consequence of an antiallergic or antiemetic drug poisoning that occurred in the past and has since resolved. This is appropriate for conditions like chronic liver damage from an antihistamine overdose or persistent vestibular dysfunction following an antiemetic poisoning.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic hepatitis).
• Ensure documentation clearly links the current condition to a past accidental antiallergic/antiemetic poisoning event.
• Do not use for acute poisoning events; refer to the appropriate acute poisoning codes for initial encounters.