One of our providers who is an Orthopedic Oncologist removed a sarcoma of the left shoulder CPT 23078 in September. He has continued to bill regular office visit codes rather than post op visits because, in his opinion, he is doing "cancer surveillance" and therefore he states that these visits would meet the criteria of a "separately identifiable E&M service during a post op period". He has examined the same shoulder and ordered and reviewed MRI's and CT scans of the same shoulder/chest to watch for metastatic lesions. There are no complications from the surgery and there are no other areas of cancerous concern. Are those E&M visits billable? Is this an acceptable practice?