Corrosion of first degree of left ankle, sequela

This code indicates a first-degree burn, specifically a superficial corrosion, affecting the left ankle. As a sequela code, it signifies a late effect or complication of a previous injury, meaning the initial corrosion occurred in the past and its residual effects are now being treated.

Use this code when documenting the long-term consequences or current treatment of a superficial chemical burn to the left ankle that occurred previously. This would apply when a patient presents for follow-up care related to scarring, pigmentation changes, or persistent sensitivity resulting from the original corrosion.

• Always assign a sequela code (S) when the patient is being treated for the residual effects of a past injury.
• Ensure documentation clearly specifies the left ankle as the affected site and confirms the first-degree nature of the corrosion.
• Do not use this code for initial encounters or active treatment of an acute corrosion.