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

This code signifies a patient presenting for follow-up care after an intentional overdose or self-poisoning attempt involving antidotes or chelating agents. These substances are typically used to counteract the effects of other poisons or to remove heavy metals from the body, but in excessive doses, they can become toxic themselves. The "subsequent encounter" indicates that the patient is receiving ongoing treatment, monitoring, or evaluation related to the initial self-harm event.

Apply this code when documenting encounters for patients who are being seen for complications, monitoring, or ongoing management following an intentional self-poisoning with antidotes or chelating agents. This includes follow-up appointments after discharge from acute care, outpatient therapy sessions, or repeat laboratory testing related to the overdose.

• Ensure documentation clearly states the intent was self-harm, not accidental.
• Verify the encounter type is "subsequent" (D) and not initial (A) or sequela (S).
• Always code the specific antidote or chelating agent if known and documented.