Other osteonecrosis, left fibula

This code signifies the death of bone tissue in the left fibula due to a loss of blood supply, not otherwise specified as spontaneous, drug-induced, or post-traumatic. This condition can lead to pain, joint collapse, and functional impairment in the lower leg.

Apply this code when documentation clearly indicates osteonecrosis affecting the left fibula, and the specific etiology (e.g., spontaneous, drug-induced, post-traumatic) is not identified or is explicitly ruled out. Supporting documentation should include imaging reports (MRI, X-ray) confirming bone necrosis and physician notes detailing the location and lack of a definitive cause.

• Ensure laterality is accurately documented; this code is specific to the left fibula.
• Do not use this code if a more specific osteonecrosis code (e.g., M87.165 for drug-induced) can be assigned based on documentation.
• Always review the medical record for any associated underlying conditions or causes that might require additional coding.