Managing and treating radiotherapy patients with Cardiac Implantable Electronic Devices (CIED) is very common to all clinics today. As more patients with CIEDs are receiving radiation treatments, assessing the risk of radiation exposure to CIED demands better understanding of the sources of their potential malfunctions. The need for comprehensive and concise set of recommendations is clearly evidenced by the numerous publications in literature on the topic and lack of a comprehensive approach. The recently published AAPM-TG203 report has focused on devising recommendations for the management of patients from simulation to post-irradiation follow-up, with a special emphasis on reducing potential damage to CIEDs.