Poisoning by therapeutic gases, undetermined, sequela

This code signifies a long-term health problem or condition that arose from an initial poisoning by therapeutic gases, where the intent of the poisoning could not be determined. It indicates that the acute phase of the poisoning has passed, but the patient continues to experience residual effects directly attributable to that event.

Use this code when documenting a patient presenting with a chronic condition or complication that is a direct consequence of a past poisoning by therapeutic gases, and the intent (accidental, intentional self-harm, assault) of the original poisoning remains unknown. This applies to follow-up encounters for ongoing management of these sequelae, not the initial acute poisoning event.

• Always sequence this code after the code for the specific sequela (e.g., chronic respiratory failure, neurological deficit).
• Ensure documentation clearly links the current condition to a past poisoning by therapeutic gases with undetermined intent.
• Do not use this code for acute poisoning events; a different code from the T41.5X category would be appropriate for the initial encounter.