Corros unsp degree of single l finger except thumb, subs

This code signifies chemical damage, such as from acids or alkalis, to a single left finger (excluding the thumb) that has progressed beyond a superficial burn. The specific degree of the corrosion is not documented or is unknown. This diagnosis indicates that the patient is receiving follow-up care for this injury.

Apply this code when a patient presents for ongoing treatment, wound care, or evaluation of a chemical burn to a single left finger (not the thumb), and the initial encounter for the injury has already been coded. This is appropriate when the medical record does not specify the depth of the corrosion (e.g., first, second, or third degree).

• Ensure the documentation clearly states "left finger" and excludes the thumb.
• Verify that the encounter is for subsequent care, not the initial treatment of the corrosion.
• Only use this code when the degree of corrosion is unspecified or not documented.