Toxic effect of carb monx from unsp source, slf-hrm, sequela

This code signifies a lasting health problem or complication resulting from a deliberate act of self-poisoning with carbon monoxide, where the specific source of the carbon monoxide is unknown. It indicates that the acute phase of the poisoning has passed, and the patient is now experiencing residual effects.

Apply this code when documenting chronic neurological deficits, organ damage, or other long-term sequelae directly attributable to a past intentional carbon monoxide exposure. This is appropriate for follow-up encounters after the initial treatment for the acute poisoning.

• Ensure documentation clearly links the current sequela to a past intentional carbon monoxide poisoning.
• Do not use for the initial acute poisoning event; that would require an acute poisoning code.
• Always append additional codes for the specific sequelae (e.g., cognitive deficits, Parkinsonism, cardiac damage).