Corrosion of first degree of right ankle, sequela

This code indicates a first-degree corrosion, often referred to as a chemical burn, affecting the right ankle. A first-degree corrosion involves only the outermost layer of skin, the epidermis, resulting in redness, mild swelling, and pain without blistering or skin loss. The "sequela" designation signifies that this code is used for complications or conditions that arise as a direct result of the initial corrosion, after the acute phase has passed.

Use this code when documenting a residual effect or late complication stemming from a first-degree chemical burn to the right ankle. This applies when the patient is presenting for treatment of a persistent issue directly attributable to the past corrosion, such as chronic discoloration, scarring, or sensitivity, rather than the initial acute injury.

• Always assign an external cause code (V00-Y99) to describe the circumstances of the corrosion.
• Ensure the documentation clearly states the "sequela" nature of the current encounter, indicating the acute phase has resolved.
• Verify the laterality (right ankle) and degree of corrosion (first degree) are explicitly documented.