Corros 3rd deg mu site of l shldr/up lmb, ex wrs/hnd, init

This code signifies a severe chemical burn affecting multiple areas of the patient's left shoulder and upper arm, excluding the wrist and hand. The injury has caused full-thickness tissue destruction, indicating damage through all layers of the skin and potentially underlying structures. This is the initial presentation for treatment of this specific injury.

Apply this code when documenting a patient presenting for the first time with a third-degree chemical burn that involves more than one site on the left shoulder and upper limb (proximal to the wrist). This would include scenarios such as an industrial accident where corrosive chemicals splashed across the shoulder and upper arm, resulting in extensive tissue necrosis.

• Ensure documentation clearly specifies "third-degree" or "full-thickness" and "corrosion" (chemical burn).
• Verify that multiple sites on the left shoulder and upper limb (excluding wrist/hand) are affected.
• Confirm this is the initial encounter for treatment of this specific burn; subsequent care would use a different seventh character.