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

This code signifies a first-degree chemical burn affecting multiple fingers on the left hand, specifically involving the nail or nail bed, but excluding the thumb. A first-degree corrosion typically presents with redness, mild swelling, and pain, without blistering or skin loss.

Apply this code when documenting an initial encounter for a patient presenting with a superficial chemical burn to the nails of multiple left fingers (excluding the thumb). This is appropriate for exposures to corrosive substances that result in only epidermal damage.

• Ensure the documentation specifies "corrosion" (chemical burn) rather than a thermal burn.
• Verify that multiple left fingers are affected and the thumb is explicitly excluded.
• Confirm this is the initial treatment for the injury to use the "A" seventh character.