Corros first degree of unsp single finger except thumb, sqla

This code signifies a first-degree corrosion (chemical burn) affecting an unspecified single finger, excluding the thumb, where the initial injury has healed but residual effects or complications persist. This indicates a superficial chemical burn that primarily damaged the epidermis, and the current encounter addresses a long-term consequence of that burn.

Use this code when documenting a patient presenting with a sequela (e.g., scarring, chronic pain, altered sensation, nail deformity) directly attributable to a past first-degree chemical burn of a single finger other than the thumb. This code is appropriate for follow-up visits addressing these lasting effects, not the initial injury.

• Requires a seventh character "S" to indicate sequela, meaning the initial injury has healed and the current visit addresses a complication or late effect.
• Ensure documentation clearly links the current condition to a previous first-degree chemical burn of a single, non-thumb finger.
• Do not use for acute chemical burns; instead, refer to the appropriate T23.0- category for initial encounters.