Secondary malignant neoplasm of bone marrow

This code signifies the presence of cancer that has spread to the bone marrow from a primary tumor located elsewhere in the body. It indicates metastatic disease affecting the hematopoietic tissue within the bone marrow, rather than a primary bone marrow cancer like leukemia.

Use this code when documentation explicitly states "secondary malignant neoplasm of bone marrow" or "metastatic cancer to bone marrow." This typically occurs in patients with a known primary malignancy who develop bone marrow involvement as a result of disease progression.

• Always sequence the primary malignant neoplasm code before this secondary site code.
• Do not confuse with primary bone marrow malignancies (e.g., leukemias, multiple myeloma), which have distinct codes.
• Ensure documentation clearly specifies "secondary" or "metastatic" to the bone marrow, not just "bone marrow involvement" without further clarification.