CPT® Code 78831

Radiopharmaceutical localization of tumor, inflammatory process or distribution of radiopharmaceutical agent(s) (includes vascular flow and blood pool imaging, when performed); tomographic (SPECT), minimum 2 areas (eg, pelvis and knees, chest and abdomen) or separate acquisitions (eg, lung ventilation and perfusion), single day imaging, or single area or acquisition over 2 or more days

The CPT® Code 78831 refers to a diagnostic imaging procedure known as radiopharmaceutical localization, which utilizes molecular imaging techniques, specifically single photon emission computed tomography (SPECT). This procedure is designed to identify the presence of tumors or inflammatory processes within the body by tracking the distribution of radiopharmaceutical agents. These agents are typically radiolabeled isotopes that can be bioengineered to target specific tissues or organs based on their physiological functions. The process begins with the establishment of an intravenous line, through which the radiolabeled isotope tracer is injected directly into the patient's circulatory system. Alternatively, a blood sample may be taken, and the white or red blood cells can be separated, tagged with the isotope tracer, and reintroduced into the patient. In some cases, radioactive agents may also be inhaled or ingested to facilitate distribution throughout the body. Once administered, the tracer travels through the bloodstream and binds to areas of inflammation or tumor growth, allowing for precise localization. The patient is then positioned on an imaging table, and a specialized gamma camera is employed to capture images of the targeted areas. This camera rotates around the patient, performing scans at various angles and intervals to gather comprehensive data. The emitted radioactive energy is converted into detailed images, which may also include blood pool imaging, illustrating how the tracer flows through the area of interest. The procedure is capable of producing three-dimensional images that provide insights into the size, volume, and biochemical processes occurring within the target tissues. The results of the imaging study are interpreted by a physician, who subsequently generates a written report detailing the findings. This code specifically applies to tomographic SPECT imaging that encompasses at least two distinct areas or separate acquisitions conducted on a single day, or a single area imaged over two or more days.