Toxic eff of carb monx from mtr veh exhaust, slf-hrm, subs

This code signifies a toxic reaction to carbon monoxide specifically originating from motor vehicle exhaust, where the exposure was deliberately self-inflicted. It indicates that the patient is receiving follow-up care for the sequelae of this intentional poisoning event, not the initial acute treatment.

Apply this code when documenting subsequent encounters for patients recovering from carbon monoxide poisoning due to attempted suicide via motor vehicle exhaust. This includes follow-up appointments for neurological deficits, cardiac complications, or psychiatric evaluation related to the self-harm incident. It is appropriate for any visit after the initial acute care for this specific type of poisoning.

• Ensure documentation clearly states the source of carbon monoxide as motor vehicle exhaust and the intent as self-harm.
• Verify that the encounter is for follow-up care, not the initial treatment of the acute poisoning.
• Always code with an accompanying external cause code (X67.-) to fully describe the intent and circumstances.