During the course of the treatment, the patient's therapy must be closely monitored by the attending physician to be sure that the proper chemotherapy drugs are given at the proper time during the radiotherapy course.  It is also important to closely monitor the patient to know when treatment with either chemotherapy or radiotherapy needs to be held.  This combined treatment usually produces greater side effects than either treatment alone, and these need to be constantly monitored and treatment initiated on a timely basis to minimize these effects.  In accordance, this requires more frequency consultation and coordination with the medical oncologist.  Therefore, this becomes a very time intensive treatment and justifies CPT Code 77470.