C31 Malignant neoplasm of accessory sinuses
ICD-10-CM category C31 sits in Chapter 2 (Neoplasms, C00-D49). It contains 6 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.
Billable codes in C31
| Code | Description |
|---|---|
C31.0 | Malignant neoplasm of maxillary sinus |
C31.1 | Malignant neoplasm of ethmoidal sinus |
C31.2 | Malignant neoplasm of frontal sinus |
C31.3 | Malignant neoplasm of sphenoid sinus |
C31.8 | Malignant neoplasm of overlapping sites of accessory sinuses |
C31.9 | Malignant neoplasm of accessory sinus, unspecified |
Search within ICD-10-CM for C31 and related codes
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