Osteonecrosis in diseases classified elsewhere, right thigh

This code signifies the death of bone tissue in the right thigh due to a loss of blood supply, occurring as a complication or manifestation of another underlying disease. This condition, also known as avascular necrosis, leads to bone collapse and joint destruction if untreated.

Apply this code when documentation clearly indicates osteonecrosis affecting the right thigh, and the provider explicitly links it to an underlying systemic disease (e.g., lupus, sickle cell anemia, long-term corticosteroid use). The medical record should specify the affected side and the causal relationship to another condition.

• Always sequence the underlying disease code first, followed by this code.
• Ensure the documentation specifies "right thigh" to avoid laterality errors.
• Distinguish from osteonecrosis not classified elsewhere (M87.- series) or osteonecrosis due to trauma.