Corrosion of unspecified degree of unspecified knee, sequela

This code signifies a long-term complication or late effect resulting from a chemical burn or corrosion affecting the knee. It indicates that the initial injury has healed, but there are residual issues or sequelae related to the corrosion, without specifying the severity or laterality.

Use this code when documenting follow-up care for a patient who previously sustained a chemical burn to the knee and is now presenting with ongoing problems directly attributable to that past injury. This applies to situations where the acute phase of the burn has passed, and the current encounter addresses the lasting impact.

• Ensure the medical record clearly links the current knee issue to a past corrosion injury.
• This code requires a seventh character "S" for sequela, indicating a late effect.
• Do not use for acute corrosion injuries; those would be coded with acute burn codes.