ICD-10-CM > C00-D49 > C76-C80 > C79 > C79.4 C79.4 Secondary malignant neoplasm of other and unspecified parts of nervous system Non-Billable/Non-Specific Codes C79.40Secondary malignant neoplasm of unspecified part of nervous systemC79.49Secondary malignant neoplasm of other parts of nervous system