What is cpt code 77603?

CPT code 77603 refers to the medical billing code used for brachytherapy, specifically for the treatment of cancer using a radioactive source. It indicates the use of a radioactive source for interstitial brachytherapy, typically involving a single source application. This code is often associated with procedures that require the placement of radioactive seeds or sources directly into or near a tumor. It is important for accurate billing and documentation in oncology practices.