Corrosion of third degree of unspecified knee, sequela

This code signifies a third-degree burn, also known as a full-thickness burn, affecting an unspecified area of the knee. It indicates that the burn has healed, and the current encounter is for a complication or late effect directly resulting from that past injury.

Apply this code when documenting a patient presenting with a long-term consequence of a severe burn to the knee, such as scar contracture, chronic pain, or functional impairment. This code is appropriate for follow-up care related to the burn's sequelae, not the initial acute injury.

• Always use this code as a secondary diagnosis, following a code for the specific sequela being treated.
• Ensure documentation clearly links the current condition to the past third-degree knee burn.
• Verify that the burn location is indeed unspecified to the knee; if a more specific knee area is documented, a different code may be more appropriate.