Toxic effect of carb monx from utility gas, undet, sequela

This code signifies a delayed or residual health problem resulting from exposure to carbon monoxide originating from utility gas, where the intent of the exposure (e.g., accidental, intentional) cannot be determined. These sequelae can manifest as neurological deficits, cardiovascular issues, or other chronic conditions long after the initial poisoning event.

Apply this code when documenting a patient presenting with persistent health issues directly attributable to a past carbon monoxide poisoning from utility gas, and the medical record does not specify whether the exposure was accidental or intentional. This code is appropriate for follow-up encounters addressing the long-term consequences of such an event.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., G92 for toxic encephalopathy).
• Ensure documentation clearly links the current condition to a past carbon monoxide exposure from utility gas.
• The "S" in the seventh character indicates sequela; do not use for initial or subsequent encounters of the acute poisoning.