Corros unsp deg mult left fngr (nail), not inc thumb, init

This diagnosis code signifies chemical damage of an undetermined severity affecting multiple fingers on the left hand, excluding the thumb. The injury specifically involves the fingernails. This indicates a burn caused by corrosive substances rather than heat.

Apply this code when documentation confirms a chemical burn to the fingernails of more than one left finger, not including the thumb, and the degree of the burn is not specified. This code is appropriate for the initial treatment of such an injury.

• Ensure the documentation specifies "corrosion" or "chemical burn" and not a thermal burn.
• Verify that multiple left fingers (excluding the thumb) are affected and the injury involves the nail.
• The "A" at the end indicates an initial encounter; use subsequent encounter codes for follow-up care.