Other secondary osteonecrosis, unspecified bone

This code signifies osteonecrosis that has developed as a consequence of another underlying condition, rather than spontaneously. It indicates bone death due to impaired blood supply, where the specific bone affected is not documented. This condition can lead to bone collapse, pain, and joint dysfunction.

Use this code when the medical record clearly states "secondary osteonecrosis" but does not specify the anatomical site. This is appropriate for cases where the etiology is known (e.g., corticosteroid-induced, post-traumatic, sickle cell disease) but the affected bone is not identified. Documentation should support a secondary cause and lack of site specificity.

• Avoid using this code if the specific bone affected by secondary osteonecrosis is documented; instead, use a more specific M87.3- subcategory.
• Always code the underlying condition causing the secondary osteonecrosis first, if known.
• Ensure documentation explicitly states "secondary" osteonecrosis; otherwise, consider primary osteonecrosis codes (M87.0-).