ICD-10-CM > Z00-Z99 > Z40-Z53 > Z51 Z51 Encounter for other aftercare and medical care Non-Billable/Non-Specific Code Also condition requiring care Type 1 Excludes follow-up examination after treatment (Z08-Z09) Codes Z51.0Encounter for antineoplastic radiation therapyZ51.1Encounter for antineoplastic chemotherapy and immunotherapyZ51.11Encounter for antineoplastic chemotherapyZ51.12Encounter for antineoplastic immunotherapyZ51.5Encounter for palliative careZ51.6Encounter for desensitization to allergensZ51.8Encounter for other specified aftercareZ51.81Encounter for therapeutic drug level monitoringZ51.89Encounter for other specified aftercareZ51.AEncounter for sepsis aftercare