Corrosion of second degree of unspecified knee, sequela

This code signifies a second-degree chemical burn (corrosion) affecting an unspecified knee, where the acute injury has healed, but residual effects or complications persist. These sequelae might include scarring, chronic pain, limited range of motion, or other long-term issues stemming from the original chemical exposure.

Use this code when documenting a patient presenting with a chronic condition or complication directly attributable to a previously sustained second-degree chemical burn of the knee. This applies to follow-up encounters for management of the long-term consequences, not the initial acute injury.

• Always use a seventh character of "S" for sequela when reporting this code.
• Code any specific sequelae (e.g., scar, contracture) in addition to this code to provide a complete clinical picture.
• Ensure documentation clearly links the current condition to the past chemical burn of the knee.