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

This code signifies a persistent, non-pressure-related open sore on an unspecified calf that has progressed to involve the underlying bone tissue, exhibiting signs of necrosis. This indicates a severe, deep tissue injury often associated with conditions like venous insufficiency, arterial disease, or neuropathic ulcers, but specifically excluding pressure ulcers.

Apply this code when documentation clearly states a chronic ulcer on the calf, explicitly identifies the absence of pressure as the etiology, and confirms the presence of bone necrosis. This is appropriate for advanced stages of non-pressure ulcers where infection or tissue death has extended beyond soft tissue into the bone.

• Ensure documentation specifies "non-pressure" etiology; otherwise, a pressure ulcer code may be more appropriate.
• Confirm the location is the "calf" and not another lower extremity site.
• Verify that bone necrosis is explicitly documented, not just deep tissue involvement or osteomyelitis without confirmed necrosis.