Corrosion of third degree of lower back, initial encounter

This diagnosis code signifies a severe chemical burn affecting the full thickness of the skin and underlying tissues in the lower back region. It indicates the initial presentation and treatment of such an injury, where the skin appears leathery, charred, or waxy white, and nerve endings are destroyed, resulting in a lack of pain sensation.

Apply this code for patients presenting with a third-degree chemical burn to the lower back, such as from prolonged exposure to strong acids or bases. This is appropriate for the initial encounter where the patient is receiving active treatment for the burn, including assessment, debridement, or preparation for grafting.

• Ensure documentation clearly specifies the cause as "corrosion" or "chemical burn" and the degree as "third."
• Verify the anatomical site is precisely "lower back" to differentiate from other trunk locations.
• Confirm this is the patient's first time receiving treatment for this specific injury; subsequent encounters will require different seventh characters.