Osteonecrosis in diseases classified elsewhere, unsp thigh

This code signifies the death of bone tissue in an unspecified thigh region due to an underlying medical condition, rather than a direct injury or idiopathic cause. This bone death results from a loss of blood supply, leading to bone collapse and potential joint destruction. The "diseases classified elsewhere" component indicates that the primary disease causing the osteonecrosis should also be coded.

Apply this code when documentation specifies osteonecrosis of the thigh, but the laterality (right or left) is not specified, and the etiology is attributed to a systemic disease (e.g., lupus, sickle cell anemia, chronic corticosteroid use). Supporting documentation should clearly link the osteonecrosis to a specific underlying condition.

• Always sequence the underlying disease code first, followed by this code.
• Avoid using this code if a more specific anatomical site within the thigh (e.g., femoral head) or laterality (right/left) is documented.
• Ensure the documentation explicitly states "unspecified thigh" or lacks laterality/specific site information to justify this code.