Corrosion of third degree of left knee, subsequent encounter

This code indicates a severe chemical burn affecting the full thickness of the skin and underlying tissues of the left knee. It signifies that the patient is receiving follow-up care for this specific injury, which would typically involve wound management, infection control, and potentially skin grafting or reconstructive procedures.

Use this code for subsequent encounters when a patient presents for ongoing treatment or management of a third-degree chemical burn to their left knee. This includes visits for wound dressing changes, debridement, assessment of healing progress, or preparation for surgical interventions after the initial treatment of the corrosion.

• Ensure documentation clearly specifies "corrosion" (chemical burn) and not a thermal burn.
• Verify the laterality is explicitly documented as "left knee."
• Confirm the encounter is for follow-up care, indicated by the "D" seventh character.