Poisoning by antidotes and chelating agents, self-harm, init

This code signifies a patient's self-inflicted poisoning specifically from substances designed to counteract other poisons or remove heavy metals from the body. This is an intentional act with the purpose of causing harm to oneself, and it represents the initial phase of treatment for this event.

Apply this code when a patient presents to an emergency department or clinic after deliberately ingesting or administering an antidote (e.g., naloxone, flumazenil) or a chelating agent (e.g., deferoxamine, EDTA) with suicidal intent. This code is appropriate for the first encounter for treatment of this specific poisoning event.

• Ensure documentation clearly states "intentional self-harm" and specifies an antidote or chelating agent as the substance.
• Always use in conjunction with codes for any associated mental health conditions, such as F53.9 for unspecified mental disorder in puerperium, or other relevant psychiatric diagnoses.
• The "A" seventh character indicates an initial encounter, meaning the patient is receiving active treatment for the poisoning.