Non-prs chronic ulc unsp prt of unsp lower leg w necros bone

This code signifies a long-standing ulcer on an unspecified part of the lower leg, not caused by pressure, that has progressed to involve necrosis (tissue death) of the underlying bone. This indicates a severe and deep wound that has eroded through soft tissue and into the skeletal structure.

Use this code when documentation clearly states a chronic, non-pressure ulcer on the lower leg with confirmed bone necrosis, but the specific location on the lower leg is not specified. This typically applies to advanced stages of venous stasis ulcers, arterial ulcers, or neuropathic ulcers where bone involvement is present.

• Ensure documentation explicitly states "necrosis of bone" and not just "exposed bone" or "osteomyelitis" without necrosis.
• If the specific location on the lower leg (e.g., calf, ankle, foot) is documented, a more specific code from the L97 series should be used.
• Always sequence this code after any underlying systemic conditions contributing to the ulcer (e.g., diabetes mellitus, peripheral artery disease).