Other secondary osteonecrosis of unspecified radius

This code signifies the death of bone tissue in an unspecified radius due to a secondary cause other than those specifically classified elsewhere. This osteonecrosis is not primary (idiopathic) and results from an underlying condition or external factor affecting the bone's blood supply.

Apply this code when documentation confirms osteonecrosis of the radius, and the etiology is secondary but not further specified (e.g., not due to trauma, drugs, or hemoglobinopathy). This code is appropriate when the medical record indicates the osteonecrosis is a complication of another disease or treatment, but the specific secondary cause is not detailed enough for a more precise code.

• Ensure the documentation clearly states "secondary osteonecrosis" and specifies the radius.
• Always look for a more specific secondary cause (e.g., steroid-induced, post-traumatic) before using this unspecified code.
• Code the underlying secondary condition first, if known and applicable, followed by this code for the osteonecrosis.