Corrosion of second degree of left thumb (nail), sequela

This code signifies a second-degree chemical burn affecting the left thumb, specifically including the nail, where the acute injury has healed and residual effects or complications are now being treated. These sequelae could include scarring, nail deformity, chronic pain, or functional limitations resulting from the original corrosion.

Apply this code when documenting the long-term consequences or late effects of a second-degree chemical burn to the left thumb, including the nail. This is appropriate for follow-up encounters where the primary focus is on managing or treating these persistent issues, rather than the initial acute injury.

• Always use this code as a secondary diagnosis, following a code that describes the specific sequela being treated (e.g., scar, chronic pain).
• Ensure documentation clearly states the burn was chemical (corrosion) and involved the left thumb and nail.
• Verify the burn was classified as second-degree and that the encounter is for a sequela, not the initial treatment.