C31.9 is the ICD-10 code for Malignant neoplasm: Accessory sinus, unspecified. It is a four-character subcategory of C31 (Malignant neoplasm of accessory sinuses), the most specific level in the WHO edition. It belongs to the block C30–C39 (Malignant neoplasms of respiratory and intrathoracic organs) in Chapter II, Neoplasms.
- Code type
- Subcategory (4 characters)
- Chapter
- II · C00–D48
- Classification
- WHO ICD-10, 2019 version
C31.9 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
C31.9Ondartet svulst i uspesifisert bihule
DC319Kræft i bihule UNS
C31.9Nasennebenhöhle, nicht näher bezeichnet
C31.9Sinus de la face, sans précision
C31.9neusbijholte, niet-gespecificeerd
C31.9Malignant neoplasm of accessory sinus, unspecified
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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