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2. ICD-10 Codes
3. Chapter - C00-D49
4. Section - C30-C39
5. Category - C31
6. C31.9

C31.9 - Malignant neoplasm of accessory sinus, unspecified

• Applicable to Malignant neoplasm of accessory sinus, unspecified
• The 2025 edition of ICD10-CM C31.9 became effective on October 1, 2024.
• This is the American ICD10-CM version of C31.9 - other international versions of ICD10 C31.9 may differ.
• C31.9 is a Billable / Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

The following codes above C31.9 contain annotation back-references that may be applicable to C31.9:

• Chapter: C00-D49 - Neoplasms
• Section: C30-C39 - Malignant neoplasms of respiratory and intrathoracic organs
• Category: C31 - Malignant neoplasm of accessory sinuses

Browse other similar CM codes:

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.