Poisoning by antidotes and chelating agents, undet, subs

This code signifies a poisoning event caused by an antidote or chelating agent where the intent (e.g., accidental, intentional self-harm) cannot be determined. The patient is receiving follow-up care for the effects of this poisoning, rather than initial treatment.

Apply this code when a patient presents for ongoing management of symptoms or complications stemming from an undetermined poisoning by an antidote or chelating agent. This would include situations like follow-up appointments for organ damage, neurological sequelae, or other persistent issues after the initial acute phase.

• Ensure the documentation clearly indicates the encounter is for subsequent care, not the initial treatment.
• Verify that the substance involved was specifically an antidote or chelating agent.
• Confirm that the intent of the poisoning is explicitly stated as "undetermined" in the medical record.