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Ch. II
ICD-10
Ch. II
C31.9
C31.9
Accessory sinus, unspecified
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Sibling codes
C31
Malignant neoplasm of accessory sinuses
C31.0
Maxillary sinus
C31.1
Ethmoidal sinus
C31.2
Frontal sinus
C31.3
Sphenoidal sinus
C31.8
Overlapping lesion of accessory sinuses
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