Corros unsp deg mult right fngr (nail), inc thumb, sequela

This code signifies a past injury to multiple right fingers, including the thumb, specifically affecting the nail due to corrosion. The "sequela" indicates that the acute phase of the injury has passed, and the patient is now experiencing a residual effect or complication from that original corrosion. This could manifest as nail deformity, discoloration, or chronic pain related to the previous corrosive exposure.

Use this code when documenting a patient presenting with a long-term or permanent consequence stemming from a prior corrosive injury to the nails of multiple right fingers and thumb. This applies to follow-up visits where the focus is on managing the chronic effects, rather than the initial acute treatment of the corrosion. Examples include evaluating nail dystrophy or pain years after a chemical burn.

• Ensure the documentation clearly states the injury is to multiple right fingers, including the thumb, and specifically involves the nail.
• Verify that the encounter is for a sequela (late effect) of the corrosion, not the acute injury itself.
• Always code the underlying cause of the corrosion (e.g., chemical exposure) as an external cause code (V00-Y99) if known and relevant to the encounter.