Question: May I report multiple units of 77301 if the treatment plan covers several target areas within the same general anatomic location? Maryland Subscriber Answer: You should report only one unit of 77301 (Intensity modulated radiotherapy plan, including dose-volume histograms for target and critical structure partial tolerance specifications) per course of treatment. IMRT precisely delivers radiation to tumors and allows physicians to deliver high-dose radiation to some parts of a tumor while delivering lower-dose radiation to areas near sensitive tissues to keep them safe. You-ll most often see IMRT used for patients with prostate, breast, head and neck, central nervous system, lung, or liver cancer. Even when the physician treats a number of targets in the same anatomic site, she has only one planning task. Therefore, a single unit of 77301 is appropriate.