C31
Non-billableMalignant neoplasm of accessory sinuses
C31 is the ICD-10-CM code for Malignant neoplasm of accessory sinuses. It is a non-billable category code — use a more specific child code such as C31.0 for billing.
- Status
- Header (non-billable)
- Chapter
- C00-D49
- Subcodes
- 6
- Edition
- FY2026
C00-D49 Neoplasms
What this means — in plain language
MedlinePlus · NIHYour paranasal sinuses are small hollow spaces around the nose. They are lined with cells that make mucus, which keeps your nose from drying out. The nasal cavity is the passageway just behind your nose. Air passes through it on the way to your throat as you breathe. Cancer of the nasal cavity and paranasal sinuses is rare. You are at greater risk if you are: Male and over 40 years old Exposed to certain workplace…
Read more about Nasal Cancer at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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