C30.0 vs C41.0
C30.0 and C41.0 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on C30.0
malignant neoplasm of nasal bone (C41.0)
C30.0
Malignant neoplasm of nasal cavity
Billable
- Chapter 2
- Neoplasms
- Section
- C30-C39
Use when the record says
- Malignant neoplasm of cartilage of nose
- Malignant neoplasm of nasal concha
- Malignant neoplasm of internal nose
- Malignant neoplasm of septum of nose
- Malignant neoplasm of vestibule of nose
Indexed under
- Esthesioneuroblastoma
- Esthesioneurocytoma
- Esthesioneuroepithelioma
- Neuroblastoma › olfactory
- Neuroepithelioma › olfactory
C41.0
Malignant neoplasm of bones of skull and face
Billable
- Chapter 2
- Neoplasms
- Section
- C40-C41
Use when the record says
- Malignant neoplasm of maxilla (superior)
- Malignant neoplasm of orbital bone
Indexed under
- Odontosarcoma, ameloblastic › upper jaw
- Carcinoma › ameloblastic › upper jaw (malignant)
- Carcinoma › intraosseous › upper jaw (malignant)
- Carcinoma › odontogenic › upper jaw (malignant)
- Fibrosarcoma › ameloblastic › upper jaw
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027