ICD-10-CM > M00-M99 > M86-M90 > M87 > M87.8 > M87.86 M87.86 Other osteonecrosis, tibia and fibula Non-Billable/Non-Specific Codes M87.861Other osteonecrosis, right tibiaM87.862Other osteonecrosis, left tibiaM87.863Other osteonecrosis, unspecified tibiaM87.864Other osteonecrosis, right fibulaM87.865Other osteonecrosis, left fibulaM87.869Other osteonecrosis, unspecified fibula