Excludes1 pair
C30.0 vs C49-
C30.0 and C49 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 C49
nose (C30.0)
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
C49
Malignant neoplasm of other connective and soft tissue
Not billable
- Chapter 2
- Neoplasms
- Section
- C45-C49
Use when the record says
- malignant neoplasm of blood vessel
- malignant neoplasm of bursa
- malignant neoplasm of cartilage
- malignant neoplasm of fascia
- malignant neoplasm of fat
- malignant neoplasm of ligament, except uterine
- malignant neoplasm of lymphatic vessel
- malignant neoplasm of muscle
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