ICD-10-CM > Z00-Z99 > Z77-Z99 > Z79 > Z79.6 > Z79.63 Z79.63 Long term (current) use of chemotherapeutic agent Non-Billable/Non-Specific Codes Z79.630Long term (current) use of alkylating agentZ79.631Long term (current) use of antimetabolite agentZ79.632Long term (current) use of antitumor antibioticZ79.633Long term (current) use of mitotic inhibitorZ79.634Long term (current) use of topoisomerase inhibitor