C11.3 vs C30.0
C11.3 and C30.0 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 posterior margin of nasal septum and choana (C11.3)
C11.3
Malignant neoplasm of anterior wall of nasopharynx
Billable
- Chapter 2
- Neoplasms
- Section
- C00-C14
Use when the record says
- Malignant neoplasm of floor of nasopharynx
- Malignant neoplasm of nasopharyngeal (anterior) (posterior) surface of soft palate
- Malignant neoplasm of posterior margin of nasal choana
- Malignant neoplasm of posterior margin of nasal septum
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
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