Poisoning by mixed antiepileptics, undetermined, sequela

This code signifies a long-term or residual effect resulting from an unconfirmed poisoning event involving a combination of antiepileptic medications. The original poisoning's intent (accidental, intentional self-harm, assault, or undetermined) could not be definitively established at the time of the acute event. The patient is now presenting for treatment of a lasting complication directly attributable to this past poisoning.

Apply this code when a patient presents with a chronic condition or permanent damage (e.g., neurological deficits, organ damage) that is a direct consequence of a past poisoning by multiple antiepileptic drugs, and the circumstances of that poisoning remain unclear. This code is used for follow-up care of these persistent effects, not for the acute poisoning episode itself.

• This "S" seventh character indicates a sequela, meaning the code is for the residual effect, not the active poisoning.
• Ensure documentation clearly links the current condition to the past undetermined mixed antiepileptic poisoning.
• Always code the specific sequela (e.g., specific neurological deficit) first, followed by this code to indicate its etiology.