Toxic effect of carb monx from unsp source, acc, subs

This code signifies a patient presenting for follow-up care or treatment of residual effects from accidental carbon monoxide poisoning, where the specific source of the exposure is unknown. It indicates that the initial injury has already been treated, and the current encounter addresses ongoing issues or complications.

Use this code for patients returning for rehabilitation, medication management, or monitoring of long-term neurological or cardiac sequelae following an accidental, unspecified carbon monoxide exposure. This applies when the patient is no longer in the acute phase of treatment but requires continued medical attention related to the poisoning.

• Always assign a code for any residual effects or sequelae of the carbon monoxide poisoning, such as neurological deficits (e.g., G92 for toxic encephalopathy).
• Ensure the "D" seventh character is appropriate for subsequent encounters; do not use for initial or sequela encounters.
• Confirm the accidental nature and unspecified source of the carbon monoxide exposure before assigning this code.