M87.8Other osteonecrosis

M87.8 is the ICD-10-CM diagnosis code for other osteonecrosis. It belongs to category M87 (osteonecrosis), block M86-M90 (other osteopathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

Within M87, choose M87.8 (Other osteonecrosis) only when documentation doesn't support a more specific option: idiopathic aseptic necrosis of bone (M87.0), due to drugs (M87.1), due to previous trauma (M87.2), other secondary osteonecrosis (M87.3) and unspecified (M87.9).

To report this condition, pick the subcode that matches the documentation: M87.80 (unspecified bone), M87.81 (shoulder), M87.82 (humerus), M87.83 (of radius, ulna and carpus), M87.84 (hand and fingers), M87.85 (pelvis and femur), M87.86 (tibia and fibula), M87.87 (ankle, foot and toes) and 2 more.

Use an additional code to identify major osseous defect, if applicable (M89.7-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.