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

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 penetrated all layers of the skin, including subcutaneous tissue, and is being managed during a follow-up visit after initial treatment.

Apply this code for patients presenting for subsequent care (e.g., wound checks, dressing changes, physical therapy) of a third-degree chemical burn to the specified left upper limb regions. This includes situations where the initial injury has been treated and the patient is now in the healing or recovery phase.

• Ensure the documentation clearly specifies a chemical burn (corrosion) and not a thermal burn.
• Verify the laterality (left) and the specific anatomical sites involved, excluding the wrist and hand.
• Confirm that the encounter is for follow-up care, indicated by the "D" seventh character.