C31 — Malignant neoplasm of accessory sinuses
Not billable
Is C31 billable?
No — C31 is a non-billable header code. C31 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 6 billable codes beneath C31.
Billable codes under this header
C31 at a glance
| Code | C31 |
|---|---|
| Description | Malignant neoplasm of accessory sinuses |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together — inherited from C30-C39
The conditions below can never be reported together with C31 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- mesothelioma (C45.-)
What codes fall under C31? (6)
How long has C31 existed?
C31 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.