Malignant neoplasm of pelvic bones, sacrum, and coccyx

This code signifies a primary cancerous tumor originating in the bones of the pelvis, the sacrum (the triangular bone at the base of the spine), or the coccyx (tailbone). It indicates that the malignancy began in these specific skeletal structures, rather than spreading from another site.

Apply this code when documentation clearly states a primary malignant neoplasm of the pelvic bones, sacrum, or coccyx. This would be supported by pathology reports confirming malignancy and imaging studies identifying the tumor's location. Use for initial diagnosis and subsequent treatment encounters related to the primary tumor.

• Differentiate between primary bone cancer and metastatic disease to these sites; metastatic bone cancer would be coded differently.
• Ensure the documentation specifies "malignant" and not a benign tumor or an unspecified neoplasm.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any associated complications or treatment codes.