ICD-10-CM > C00-D49 > C69-C72 > C72 > C72.2 C72.2 Malignant neoplasm of olfactory nerve Non-Billable/Non-Specific Applicable To Malignant neoplasm of olfactory bulb Codes C72.20Malignant neoplasm of unspecified olfactory nerveC72.21Malignant neoplasm of right olfactory nerveC72.22Malignant neoplasm of left olfactory nerve