CPT® Code 77021

Magnetic resonance imaging guidance for needle placement (eg, for biopsy, needle aspiration, injection, or placement of localization device) radiological supervision and interpretation

This CPT® code 77021 pertains to the use of magnetic resonance imaging (MRI) guidance specifically for the placement of needles in various medical procedures, including biopsies, needle aspirations, injections, or the placement of localization devices. The procedure involves the utilization of MRI technology to accurately locate the target area within the body that requires intervention. Once the area is identified, it is typically anesthetized to minimize discomfort during the procedure. Following this, a needle is inserted under the guidance of MRI to carry out the intended action, which may involve extracting tissue samples for biopsy, administering therapeutic or diagnostic injections, or positioning a localization device for further examination of a tumor or mass. MRI is a sophisticated imaging modality that is non-invasive and does not involve ionizing radiation, making it a safer alternative for patients. It operates on the principle of magnetic properties of hydrogen atoms present in the body. When exposed to a strong magnetic field and radiofrequency waves, these hydrogen nuclei emit signals that are captured and processed by a computer to generate high-resolution, three-dimensional images of the internal structures. This imaging capability is crucial for ensuring precise needle placement, which is essential for the success of the procedures being performed. Additionally, the needles used in conjunction with MRI guidance may be specially designed with features such as metallic ringlets, contrast material coatings, or signal-receiving coils at their tips to enhance the accuracy and effectiveness of the procedure.