ICD-10 Code C41.4 – Malignant neoplasm of pelvic bones, sacrum and coccyx (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C41.4 – Malignant neoplasm of pelvic bones, sacrum and coccyx
What it is
C41.4 identifies a malignant primary tumor arising in the pelvic bones, sacrum, or coccyx. Use it for cancers that originate in these bones, not for spread from another site.
Clinical signs
Clinical features vary; refer to documentation. Commonly, patients may have localized pain, swelling, or a mass, and imaging or pathology should support a primary bone malignancy.
When to use this code
Use C41.4 when the provider documents a primary malignant neoplasm of the pelvic bones, sacrum, or coccyx. It may appear in oncology, pathology, or imaging reports when the tumor site is clearly stated.
Choose this code only when the neoplasm is confirmed or documented as primary at this anatomic site. Check documentation if the record instead describes metastatic disease, uncertain behavior, or a benign lesion.
Do not use for
Do not use C41.4 for secondary malignant neoplasms to these bones or for benign or in situ lesions. Check documentation if the site or primary origin is unclear.
Coding tip
Verify that the record names the pelvic bones, sacrum, or coccyx as the primary site before assigning C41.4.