Toxic effect of carbon dioxide, undetermined, sequela

This code indicates a long-term or residual health problem resulting from a past exposure to carbon dioxide, where the intent of the exposure (e.g., accidental, intentional self-harm) cannot be determined. These sequelae can manifest as persistent neurological deficits, respiratory issues, or other chronic conditions directly attributable to the prior toxic effect.

Use this code when documenting a current condition that is a lasting consequence of carbon dioxide poisoning, and the circumstances surrounding the original exposure are unknown or unspecifiable. This applies to situations where the acute phase of the poisoning has resolved, but the patient continues to experience related health issues.

• Always sequence this sequela code after the code for the specific residual condition being treated.
• Ensure documentation clearly links the current condition to a past carbon dioxide exposure.
• Only use the "undetermined" character when the intent of the poisoning cannot be clarified from the medical record.