ICD-10 Code C41 – Malignant neoplasm of bone and articular cartilage of other and unspecified sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C41 – Malignant neoplasm of bone and articular cartilage of other and unspecified sites
What it is
C41 identifies a malignant tumor arising in bone or articular cartilage at a site not named elsewhere in the code set. Use it when the record documents a primary cancer of these tissues but does not specify a more exact location.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include persistent localized pain, swelling, tenderness, or pathologic fracture, but the diagnosis should be supported by imaging, pathology, or specialist assessment.
When to use this code
Use this code when the provider documents a malignant neoplasm of bone or articular cartilage and the site is other or unspecified. It also fits cases where the primary bone/cartilage malignancy is confirmed, but the exact anatomic location is not stated. Code the documented site if a more specific option is available.
Do not use for
Do not use C41 for benign bone lesions, metastatic disease to bone, or tumors of soft tissue. If the record names a more specific bone site, choose that code instead.
Coding tip
Check the pathology or operative note for the exact primary site before defaulting to an unspecified code.