Corrosion of third degree of left knee, sequela

This code signifies a deep chemical burn affecting the left knee, resulting in full-thickness tissue destruction, including skin, subcutaneous tissue, and potentially muscle or bone. It indicates that the burn is no longer an acute injury but rather a long-term complication or residual effect of the initial corrosion.

Apply this code when documenting permanent scarring, contractures, chronic pain, functional limitations, or other lasting issues directly attributable to a third-degree chemical burn of the left knee. This code is appropriate for follow-up encounters addressing these persistent sequelae, even years after the initial injury.

• Always use an external cause code (V00-Y99) in conjunction with this code to describe the circumstances of the corrosion.
• Ensure documentation clearly specifies "left knee" and "third degree" to support this specific code.
• This "S" encounter code is for sequelae, meaning the acute phase of the injury has passed and the patient is being treated for residual effects.