Corros first degree of unsp mult fngr, not inc thumb, sqla

This code signifies a healed or residual effect from a first-degree corrosive burn affecting multiple fingers, excluding the thumb. The injury involves only the outermost layer of skin, similar to a superficial burn, and the "nail" parenthetical indicates that the nail unit may have been involved.

Apply this code when documenting the long-term consequences or late effects of a first-degree chemical burn to multiple fingers (not including the thumb). This would be used after the acute phase of the injury has resolved, and the patient is presenting for follow-up related to the scar, discoloration, or other persistent issues from the original corrosive exposure.

• Always use this code as a secondary diagnosis, following the code for the original corrosive burn (if still relevant) or another primary diagnosis for the current encounter.
• Ensure documentation clearly specifies "first-degree" and "multiple fingers" (excluding the thumb) to support this specific code.
• The "S" in the seventh character indicates a sequela, meaning it's for complications or conditions arising as a direct result of the initial injury, after the acute phase has passed.