Osteonecrosis in diseases classd elswhr, right ank/ft

This code signifies the death of bone tissue in the right ankle and/or foot due to a loss of blood supply, occurring as a manifestation of another underlying disease process. This condition, also known as avascular necrosis, leads to bone collapse and joint destruction in the affected area.

Apply this code when documentation explicitly states osteonecrosis or avascular necrosis of the right ankle and/or foot, and clearly links it to an underlying systemic disease (e.g., lupus, sickle cell anemia, steroid use). The medical record should specify the laterality (right) and the anatomical site (ankle and/or foot).

• Always sequence the underlying disease (e.g., lupus, sickle cell anemia) first, followed by this code.
• Ensure documentation specifies "right" ankle and/or foot; otherwise, consider M90.572 (left) or M90.579 (unspecified).
• Distinguish from osteonecrosis not classified elsewhere (M87.-) or post-traumatic osteonecrosis (M87.1-).