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

This code indicates a chemical burn of an unknown severity affecting multiple fingers on the left hand, excluding the thumb, specifically involving the nail or nail bed. The injury is being treated in a follow-up encounter, meaning it's not the initial presentation of the burn.

Apply this code when documenting subsequent care for a patient who previously sustained a chemical injury to the nails of multiple left fingers (not including the thumb). This is appropriate for office visits, wound care, or other follow-up appointments related to the initial corrosion.

• Ensure the documentation clearly specifies "subsequent encounter" for the chemical burn.
• Verify that the injury involves multiple fingers on the left hand, and explicitly excludes the thumb.
• Confirm the burn is chemical in nature (corrosion) and affects the nail or nail bed.