C31

Non-billable

Malignant 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

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code C31?
C31 is the ICD-10-CM code for "Malignant neoplasm of accessory sinuses". It falls under C00-D49 Neoplasms.
Is C31 a billable code?
No — C31 is a non-billable header code. Use a more specific child code (such as C31.0) for billing.
What are the subcodes of C31?
C31 has 6 more specific child codes, including C31.0, C31.1, C31.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

Look up another ICD-10 code or condition

Powered by Eleplan

Free ICD-10 lookup is just the start. Eleplan keeps the whole care plan in one place.

Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, with Ellie, your AI care assistant, on top of it. Free to start.