Poisoning by chloramphenicol group, accidental, init

This code signifies an acute, unintended adverse reaction to a chloramphenicol-based medication, resulting in a poisoning event. It indicates the patient's initial presentation for treatment of the toxic effects from the drug.

Apply this code when a patient presents to an emergency department or physician's office with symptoms of chloramphenicol poisoning due to an accidental overdose, incorrect administration, or an unexpected toxic effect from a therapeutic dose. This is appropriate for the first encounter related to this specific poisoning event.

• Always use in conjunction with an external cause code (e.g., Y40.0 for chloramphenicol as the cause of adverse effect in therapeutic use) to fully describe the event.
• Ensure the "A" for initial encounter is appropriate; subsequent encounters for the same poisoning would use "D" or "S."
• Verify the specific drug involved is a chloramphenicol group antibiotic to ensure accurate code selection.