Non-pressure chronic ulcer of unsp calf w necrosis of muscle

This code signifies a chronic, non-pressure-related ulcer located on an unspecified calf, characterized by the presence of necrotic muscle tissue. This indicates a severe, deep tissue loss extending beyond the skin and subcutaneous layers into the muscle, without an etiology of sustained pressure.

Apply this code when documentation clearly identifies a chronic ulcer on the calf, explicitly stating that it is not pressure-related and involves muscle necrosis. This is typically seen in patients with underlying vascular disease, diabetes, or other conditions leading to chronic tissue breakdown. Documentation should specify the calf as the location and confirm the presence of muscle necrosis.

• Ensure the documentation explicitly states "non-pressure" and "necrosis of muscle" for the calf ulcer.
• Do not use this code for pressure ulcers; refer to the L89 series for those.
• Code any underlying systemic conditions (e.g., diabetes, peripheral artery disease) as primary or secondary diagnoses, as appropriate, to fully explain the patient's clinical picture.