Corrosion of third degree of unspecified lower leg, sequela

This code signifies a third-degree chemical burn (corrosion) affecting an unspecified area of the lower leg, where the acute injury has healed and the patient is now presenting for treatment of a residual condition or complication directly resulting from that past corrosion. Third-degree burns involve full-thickness destruction of the skin and underlying tissue.

Apply this code when documenting a long-term complication or sequela of a previously sustained third-degree chemical burn to the lower leg. Examples include chronic pain, scarring, contractures, or non-healing ulcers that are directly attributable to the original corrosion. This code is appropriate for follow-up encounters addressing these persistent issues.

• Always assign an external cause code (V00-Y99) to describe the circumstances of the corrosion, if known.
• Do not use this code for acute chemical burns; instead, use the appropriate T24.73xA code for initial encounters.
• Ensure documentation clearly links the current condition to the past third-degree corrosion of the lower leg.