Poisoning by unsp topical agent, undetermined, sequela

This code signifies a long-term health problem or complication resulting from an exposure to an unspecified topical agent, where the intent of the poisoning (accidental, intentional self-harm, assault) cannot be determined. The original poisoning event has resolved, but its lasting effects are now being treated.

Use this code when documenting a sequela (e.g., chronic dermatitis, scarring, organ damage) that is directly attributable to a past poisoning by a topical substance, and the circumstances surrounding the original exposure are unknown or unclarified. This code is appropriate when the patient is presenting for treatment of the residual effects, not the acute poisoning itself.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a past, undetermined poisoning by a topical agent.
• Avoid using this code for acute poisoning events; instead, use the appropriate acute poisoning codes (T49.91-T49.93).