ICD-10 diagnosis code

C31 Malignant neoplasm of accessory sinuses

C31 is the ICD-10 code for Malignant neoplasm of accessory sinuses. It is a three-character category divided into 6 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block C30–C39 (Malignant neoplasms of respiratory and intrathoracic organs) in Chapter II, Neoplasms.

Code type: Category (3 characters)
Chapter: II · C00–D48
Classification: WHO ICD-10, 2019 version

Subcodes of C31

C31 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

C31Malign tumör i näsans bihålor

DenmarkICD-10-DK

DC31Kræft i bihuler

FinlandICD-10-FI

C31Nenän sivuontelo(ide)n syöpä

GermanyICD-10-GM

C31Bösartige Neubildung der Nasennebenhöhlen

FranceICD-10-FR

C31Tumeur maligne des sinus de la face

NetherlandsICD-10-NL

C31maligne neoplasma van neusbijholten

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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