Poisoning by 4-Aminophenol derivatives, accidental, init

This code signifies an accidental overdose or toxic exposure to medications or substances containing 4-aminophenol derivatives, such as acetaminophen (paracetamol). The patient is experiencing the initial effects and receiving active treatment for the poisoning.

Apply this code when a patient presents to the emergency department or clinic with symptoms of acetaminophen toxicity due to an unintentional ingestion. This includes cases where the patient mistakenly took too much of the medication or was accidentally given an incorrect dose.

• Always confirm the intent of the poisoning (accidental, intentional self-harm, assault, undetermined) as this impacts the 5th character.
• Ensure the encounter is the "initial encounter" for active treatment of the poisoning. Subsequent care would use a different 7th character.
• Code any associated adverse effects or manifestations of the poisoning (e.g., acute liver failure) in addition to this code.