C40.9Malignant neoplasm of unspecified bones and articular cartilage of limb

C40.9 is the ICD-10-CM diagnosis code for malignant neoplasm of unspecified bones and articular cartilage of limb. It belongs to category C40 (malignant neoplasm of bone and articular cartilage of limbs), block C40-C41 (malignant neoplasms of bone and articular cartilage) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within C40, choose C40.9 (unspecified bones and articular cartilage of limb) only when documentation doesn't support a more specific option: scapula and long bones of upper limb (C40.0), short bones of upper limb (C40.1), long bones of lower limb (C40.2), short bones of lower limb (C40.3) and overlapping sites of bone and articular cartilage of limb (C40.8).

To report this condition, pick the subcode that matches the documentation: C40.90 (limb), C40.91 (limb) and C40.92 (limb).

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.