C31.1 is the ICD-10 code for Malignant neoplasm: Ethmoidal sinus. 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
C31.1 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
C31.1Ondartet svulst i ethmoidalsinus
DC311Kræft i sinus ethmoidalis
C31.1Sinus ethmoidalis [Siebbeinzellen]
C31.1Sinus ethmoïdal
C31.1sinus ethmoidalis
C31.1Malignant neoplasm of ethmoidal sinus
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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