Malignant neoplasm of pelvic bones, sacrum and coccyx

This code signifies a primary cancerous tumor originating in the bones of the pelvis, the sacrum, or the coccyx. These are malignant growths that have developed directly within 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 is appropriate for initial diagnoses, active treatment, or follow-up care for this specific primary bone cancer. Supporting documentation would include pathology reports confirming malignancy and imaging studies identifying the tumor's location.

• Differentiate between primary bone cancer and metastatic disease to these sites; metastatic bone cancer would be coded differently.
• Ensure the documentation specifies "primary" or "originating in" the pelvic bones, sacrum, or coccyx to justify this code.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless specific coding guidelines dictate otherwise (e.g., for complications of treatment).