C72: Malignant neoplasm of spinal cord, cranial nerves and other parts of central nervous system
C72.3: Malignant neoplasm of optic nerve
C72.30: Malignant neoplasm of unspecified optic nerve
C72.31: Malignant neoplasm of right optic nerve
C72.32: Malignant neoplasm of left optic nerve

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