Toxic effect of carb monx from mtr veh exhaust, undet, sqla

This code signifies the long-term or residual effects resulting from carbon monoxide poisoning specifically due to motor vehicle exhaust, where the intent of the exposure (accidental, intentional, or assault) cannot be determined. These sequelae can manifest as neurological deficits, cardiovascular issues, or other chronic health problems that persist after the initial acute phase of poisoning.

Apply this code when documenting chronic conditions or persistent symptoms directly attributable to a past carbon monoxide exposure from vehicle exhaust, and the circumstances surrounding the exposure remain unclear. This is appropriate for follow-up encounters where the patient is being treated for the lasting impact of such an event, rather than the acute poisoning itself.

• Always assign an additional code(s) to specify the particular sequela (e.g., G92 for toxic encephalopathy).
• Ensure documentation clearly links the current condition to the past carbon monoxide exposure from motor vehicle exhaust.
• Only use the "S" (sequela) seventh character for conditions that are residual effects after the acute phase of the poisoning has passed.