Secondary malignant neoplasm of bone and bone marrow

This code signifies the presence of a malignant tumor that has spread to the bone or bone marrow from a primary cancer site elsewhere in the body. It indicates metastatic disease affecting the skeletal system, rather than a cancer that originated in the bone itself.

Apply this code when documentation clearly states a secondary or metastatic malignancy involving bone or bone marrow. This is typically used in patients with a known primary cancer who subsequently develop bone metastases, confirmed by imaging (e.g., X-ray, MRI, bone scan) or biopsy.

• Always sequence the primary malignant neoplasm first, followed by this code for the secondary site.
• Do not use this code for primary bone cancers (e.g., osteosarcoma); those are coded to specific primary bone malignancy codes.
• Ensure documentation specifies "secondary" or "metastatic" to bone/bone marrow; "bone cancer" alone is insufficient without further clarification.