Superficial frostbite of right knee and lower leg, sequela

This code indicates a past episode of superficial frostbite affecting the right knee and/or lower leg, where residual effects or complications are now being treated. Superficial frostbite involves damage to the skin and subcutaneous tissue, but not deeper structures. The "sequela" designation signifies that the current encounter addresses a long-term consequence of the original injury.

Apply this code when a patient presents for treatment of chronic pain, numbness, skin discoloration, or other persistent issues directly resulting from a superficial frostbite injury to their right knee or lower leg that occurred in the past. This code is appropriate for follow-up care related to the lasting impact of the frostbite, not the initial acute injury.

• Always use this code as a secondary diagnosis, following a code for the specific sequela being treated (e.g., chronic pain, neuropathy).
• Ensure documentation clearly links the current condition to a prior superficial frostbite of the right knee or lower leg.
• The "S" in the 7th character indicates sequela; do not use for initial or subsequent encounters for the acute injury.