Osteonecrosis due to previous trauma, unspecified bone

This code signifies the death of bone tissue resulting from a prior traumatic injury, where the specific bone affected is not documented. It represents a condition where the blood supply to a section of bone has been compromised due to an earlier physical insult, leading to bone cell necrosis. This can result in pain, joint collapse, and functional impairment.

Use this code when documentation clearly links osteonecrosis to a past traumatic event, but the specific bone involved is not specified. This is appropriate when the physician's notes indicate "post-traumatic osteonecrosis" without further anatomical detail. Supporting documentation includes imaging reports (MRI, X-ray) confirming osteonecrosis and a history of trauma.

• Ensure the documentation explicitly states "previous trauma" as the etiology; do not assume.
• If the specific bone is identified (e.g., femoral head), use a more specific code from the M87.2 series.
• Always sequence this code after any acute traumatic injury code if the trauma is still being treated.