Toxic eff of unsp noxious sub eaten as food, slf-hrm, subs

This code signifies a patient presenting for follow-up care related to a previous act of intentional self-harm involving the ingestion of an unknown harmful substance consumed as food. The initial poisoning event is no longer acute, and the patient is receiving ongoing treatment or monitoring for its effects.

Apply this code for subsequent encounters when a patient is being managed for complications, sequelae, or ongoing treatment stemming from a prior intentional self-harm attempt by ingesting an unspecified noxious substance mistaken or presented as food. This includes follow-up appointments for psychiatric evaluation, organ damage monitoring, or rehabilitation after the initial acute phase.

• Ensure documentation clearly states "subsequent encounter" for this specific poisoning event.
• Confirm the intent was self-harm and the substance was ingested as food, even if unspecified.
• Do not use for initial acute poisoning encounters; a code from the "A" or "D" seventh character category would be appropriate for the initial visit.