ICD-10-CM C31.9: Malignant neoplasm of accessory sinus, unspecified

Parent Code (Less Specific):

About ICD-10-CM Code C31.9 (Malignant neoplasm of accessory sinus)

ICD-10-CM code C31.9 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM C31.9 became effective on October 1, 2024.

This page provides detailed information about C31.9 - Malignant neoplasm of accessory sinus, unspecified. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Malignant neoplasm of accessory sinus related to unspecified.