--- M87.161 Osteonecrosis due to drugs, right tibia

--- M87.162 Osteonecrosis due to drugs, left tibia

--- M87.163 Osteonecrosis due to drugs, unspecified tibia

--- M87.164 Osteonecrosis due to drugs, right fibula

--- M87.165 Osteonecrosis due to drugs, left fibula

--- M87.166 Osteonecrosis due to drugs, unspecified fibula