Osteonecrosis due to previous trauma, other site

This code identifies the death of bone tissue resulting from impaired blood supply, specifically when the cause is attributed to a prior traumatic injury. It applies to osteonecrosis affecting any bone site other than those explicitly classified elsewhere (e.g., hip, shoulder, knee, ankle, foot, wrist, hand). The condition leads to bone collapse and subsequent joint destruction if left untreated.

Assign this code when documentation clearly links osteonecrosis in a non-specified anatomical location to a history of trauma. This includes cases where the trauma occurred months or years prior to the onset of osteonecrosis symptoms. Supporting documentation should specify the affected bone and the traumatic etiology.

• Ensure the documentation explicitly states "due to previous trauma" or similar phrasing to justify the causal link.
• Verify the affected site is not more specifically coded elsewhere (e.g., M87.21-M87.27).
• Sequence this code as a primary diagnosis when the osteonecrosis is the reason for the encounter, or as a secondary diagnosis when it's a co-morbidity.