Poisoning by hydantoin derivatives, accidental, init

This code signifies an accidental overdose or adverse reaction to a hydantoin derivative medication, such as phenytoin, resulting in toxic effects. It indicates that the patient unintentionally ingested or was exposed to an excessive amount of the substance, leading to a poisoning event.

Apply this code when a patient presents with symptoms of hydantoin toxicity due to an accidental ingestion, medication error, or unintentional over-administration. This is specifically for the initial encounter where the poisoning is being evaluated and treated.

• Ensure documentation clearly states the poisoning was accidental and not intentional self-harm.
• This "A" suffix indicates the initial encounter for this condition; subsequent care would use the appropriate follow-up or sequela suffix.
• Always code the specific manifestation of the poisoning (e.g., seizures, coma) as an additional diagnosis.