Toxic effect of sulfur dioxide, undetermined, sequela

This code signifies a long-term health problem or residual effect resulting from a past exposure to sulfur dioxide, where the intent of the exposure (e.g., accidental, intentional self-harm) cannot be determined. These sequelae can manifest as chronic respiratory issues, persistent skin conditions, or other lasting organ damage.

Apply this code when documentation clearly indicates a current condition is a direct consequence of a previous sulfur dioxide poisoning, and the original poisoning event's intent is unknown or unspecified. This is appropriate for follow-up encounters addressing the chronic complications rather than the acute poisoning itself.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Ensure documentation explicitly links the current condition to a past sulfur dioxide exposure.
• Only use the "S" seventh character for sequelae; do not use for acute or initial encounters.