Corrosion of third degree of lower back, sequela

This code signifies a severe, full-thickness injury to the lower back caused by a corrosive substance, where the acute phase of the injury has passed, and the long-term effects or complications are now being addressed. This type of burn damages all layers of the skin, including underlying tissue, and often results in significant scarring and functional impairment.

Use this code when documenting the ongoing management or treatment of complications, such as contractures, chronic pain, or non-healing ulcers, that are directly attributable to a third-degree corrosive burn of the lower back that occurred in the past. It is appropriate for follow-up encounters after the initial healing of the acute injury.

• Always use in conjunction with an external cause code (V00-Y99) to describe the circumstances of the injury.
• Do not use for initial encounters or active treatment of the acute burn; use the appropriate acute burn code for that phase.
• Ensure documentation clearly links the current condition to the previous corrosive burn of the lower back.