Excludes1 pair
C11.3 vs C30.0
C11.3 and C30.0 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
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