Final answer:
Z codes used to explain continuing surveillance after completed treatment for malignant neoplasm are categorized as Follow-up. Such codes are important for indicating post-treatment care monitoring for cancer recurrence.
Step-by-step explanation:
The type of Z codes used to explain continuing surveillance after completed treatment for a malignant neoplasm is Follow-up. In the context of ICD-10 coding, a follow-up code (typically categories Z08-Z09) indicates that the patient is returning for re-examination and observation after a treatment phase is completed. These follow-up visits are a critical part of post-treatment care and are used to monitor the patient's condition and detect any signs of a recurrence. The follow-up care may include regular scans, blood tests, or other procedures as deemed necessary by the healthcare provider.