Malignant neoplasm of bone and articular cartilage of other and unspecified sites
In Malignant neoplasms of bone and articular cartilage (C40-C41), chapter 2: Neoplasms
6 billable codes under C41: all are a CC; all map to HCC 21 (Lymphoma and Other Cancers).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Excludes1: not coded here, use a different code
Also applies, from Malignant neoplasms of bone and articular cartilage (C40-C41)
These notes sit on C40-C41 and apply to every code under it, including C41.
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding benign and malignant neoplasms: using the Neoplasm Table, sequencing primary and secondary sites, treatment encounters, complications, and current cancer versus personal history.
- Admission/Encounter for treatment of primary site (page 33)
- Admission/Encounter for treatment of secondary site (page 33)
- Coding and sequencing of complications (page 34)
- Primary malignancy previously excised (page 34)
- Admissions/Encounters involving antineoplastic chemotherapy, immunotherapy and radiation therapy (page 35)
- Admission/encounter to determine extent of malignancy (page 36)
- Symptoms, signs, and abnormal findings listed in Chapter 18 associated with neoplasms (page 36)
- Admission/encounter for pain control/management (page 36)
All codes under C41
C41 can't be used on a claim. Pick a billable code below; grey headings group them.
- C41.0Malignant neoplasm of bones of skull and face
- C41.1Malignant neoplasm of mandible
- C41.2Malignant neoplasm of vertebral column
- C41.3Malignant neoplasm of ribs, sternum and clavicle
- C41.4Malignant neoplasm of pelvic bones, sacrum and coccyx
- C41.9Malignant neoplasm of bone and articular cartilage, unspecified
C41 MS-DRGs
As the principal diagnosis, the billable codes under C41 group to MS-DRG 542, 543, 544, 456, 457, or 458 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 542 Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy with MCC (5 of 6 codes)
- DRG 543 Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy with CC (5 of 6 codes)
- DRG 544 Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy without CC/MCC (5 of 6 codes)
- DRG 456 Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection with MCC (1 of 6 codes)
- DRG 457 Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection with CC (1 of 6 codes)
- DRG 458 Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection without CC/MCC (1 of 6 codes)
Other codes that refer to C41
Notes on these codes point to C41.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Bone Cancer
Cancer that starts in a bone is uncommon. Cancer that has spread to the bone from another part of the body is more common. There are three types of bone cancer:
Read more about bone cancer on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.