Malignant neoplasm of short bones of unspecified lower limb

This code signifies a primary cancerous tumor originating in the short bones of the lower limb, such as the tarsals or metatarsals, when the specific side (right or left) is not documented. It indicates an uncontrolled growth of abnormal cells within these bones.

Apply this code when documentation confirms a malignant neoplasm of a short bone in the lower extremity, but the laterality is not specified. This is appropriate for pathology reports confirming malignancy in a foot bone when the operative report or other clinical notes do not indicate which foot.

• Always seek clarification from the provider if laterality is missing, as a more specific code exists.
• Do not use this code for secondary (metastatic) malignancies; instead, code the primary site and then the secondary site with the appropriate secondary neoplasm code.
• Ensure the documentation clearly states "malignant neoplasm" and not a benign tumor or a tumor of uncertain behavior.