M87.2 - Osteonecrosis due to previous trauma
M87.25 - Osteonecrosis due to previous trauma, pelvis and femur
M87.250 - Osteonecrosis due to previous trauma, pelvis
M87.251 - Osteonecrosis due to previous trauma, right femur
M87.252 - Osteonecrosis due to previous trauma, left femur
M87.256 - Osteonecrosis due to previous trauma, unspecified femur