--- M87.171 Osteonecrosis due to drugs, right ankle

--- M87.172 Osteonecrosis due to drugs, left ankle

--- M87.173 Osteonecrosis due to drugs, unspecified ankle

--- M87.174 Osteonecrosis due to drugs, right foot

--- M87.175 Osteonecrosis due to drugs, left foot

--- M87.176 Osteonecrosis due to drugs, unspecified foot

--- M87.177 Osteonecrosis due to drugs, right toe(s)

--- M87.178 Osteonecrosis due to drugs, left toe(s)

--- M87.179 Osteonecrosis due to drugs, unspecified toe(s)