Other secondary osteonecrosis, left femur

This code signifies the death of bone tissue in the left thigh bone (femur) due to a cause other than a primary osteonecrosis. This bone death is a secondary complication of another underlying condition or treatment, leading to structural collapse and potential joint damage.

Use this code when documentation specifies osteonecrosis of the left femur that is clearly identified as secondary, but the specific cause (e.g., corticosteroid-induced, post-traumatic, sickle cell) is not explicitly stated or is categorized as "other." This applies to cases where the necrosis is not idiopathic or primary.

• Ensure documentation specifies "secondary" osteonecrosis and laterality (left femur).
• Always code the underlying cause of the secondary osteonecrosis first, if known and documented.
• Distinguish from M87.052 (idiopathic osteonecrosis, left femur) and M87.152 (drug-induced osteonecrosis, left femur) based on documented etiology.