Osteonecrosis in diseases classd elswhr, left ankle and foot

This diagnosis code signifies the death of bone tissue in the left ankle and foot due to an interruption of blood supply, occurring as a manifestation of another underlying disease. This condition can lead to bone collapse, pain, and joint dysfunction in the affected area. The osteonecrosis is not the primary disease but a secondary complication.

Use this code when documentation clearly indicates avascular necrosis of the left ankle or foot, and the physician explicitly links it to an underlying systemic disease (e.g., lupus, sickle cell anemia, chronic corticosteroid use). The medical record should specify the left side and the ankle/foot anatomical site.

• Always sequence the underlying systemic disease code first, followed by this code.
• Ensure the documentation specifies "left" ankle and foot; do not use for unspecified side or right side.
• Distinguish from osteonecrosis not associated with another underlying disease (M87.- codes).