Non-pressure chronic ulcer of left ankle w necrosis of bone

This code signifies a persistent, open sore on the left ankle that is not caused by pressure, and has progressed to involve the underlying bone tissue. This indicates a severe, deep ulceration with significant tissue destruction extending beyond the skin and subcutaneous layers.

Apply this code when documentation clearly states a chronic, non-pressure ulcer located specifically on the left ankle, and imaging or surgical findings confirm necrosis (death) of the bone. This typically occurs in patients with underlying conditions such as diabetes, peripheral vascular disease, or venous insufficiency.

• Ensure documentation explicitly states "non-pressure" to differentiate from pressure ulcers.
• Verify the laterality (left ankle) and the specific tissue involvement (bone necrosis).
• Always sequence this code after any underlying systemic condition contributing to the ulcer (e.g., E11.621 for diabetic ulcer).