Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
C31: Malignant neoplasm of accessory sinuses
C31.0: Malignant neoplasm of maxillary sinus
C31.1: Malignant neoplasm of ethmoidal sinus
C31.2: Malignant neoplasm of frontal sinus
C31.3: Malignant neoplasm of sphenoid sinus
C31.8: Malignant neoplasm of overlapping sites of accessory sinuses
C31.9: Malignant neoplasm of accessory sinus, unspecified
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