M90.5 - Osteonecrosis in diseases classified elsewhere
M90.56 - Osteonecrosis in diseases classified elsewhere, lower leg
M90.561 - Osteonecrosis in diseases classified elsewhere, right lower leg
M90.562 - Osteonecrosis in diseases classified elsewhere, left lower leg
M90.569 - Osteonecrosis in diseases classified elsewhere, unspecified lower leg