Osteonecrosis due to previous trauma, unspecified tibia

This code signifies the death of bone tissue in the unspecified tibia resulting from a prior traumatic injury. This avascular necrosis impairs the bone's structural integrity and can lead to pain, collapse, and degenerative changes. The "unspecified" nature indicates that the laterality (left or right) of the tibia is not documented.

Assign this code when documentation clearly links osteonecrosis of the tibia to a previous traumatic event, and the specific side (left or right) of the tibia is not specified. This typically occurs after fractures, dislocations, or other significant injuries that disrupt blood supply to the bone. Supporting documentation would include imaging reports (e.g., MRI, X-ray) confirming osteonecrosis and clinical notes detailing the history of trauma.

• Ensure the documentation explicitly states "previous trauma" as the etiology; otherwise, consider other osteonecrosis codes.
• Verify laterality. If left or right tibia is specified, use the more specific code (M87.261 or M87.262).
• Code any associated pathological fractures separately if documented.