Toxic effect of mercury and its compounds, self-harm, subs

This code signifies a patient presenting for follow-up care or treatment of adverse health effects resulting from the deliberate ingestion, exposure, or administration of mercury or its compounds with the intent to cause self-harm. The patient is no longer in the acute phase of treatment for the initial poisoning.

Apply this code for patients returning to the clinic or hospital for ongoing management of complications, rehabilitation, or mental health support related to a past intentional mercury poisoning event. This includes monitoring for neurological damage, kidney dysfunction, or other long-term sequelae after the initial emergency treatment.

• Requires an external cause code (X-code) to fully describe the circumstances of the poisoning.
• Use a mental health diagnosis code (e.g., F-code) in conjunction to capture the underlying self-harm intent.
• Distinguish from initial encounters (A) and sequela encounters (S) based on the patient's current stage of care.