CPT® Code 73220

Magnetic resonance (eg, proton) imaging, upper extremity, other than joint; without contrast material(s), followed by contrast material(s) and further sequences

Magnetic resonance imaging (MRI) is a sophisticated imaging technique utilized to visualize internal structures of the body, particularly the upper extremities, excluding joints. This noninvasive procedure leverages the magnetic properties of hydrogen atoms present in the body, allowing for detailed imaging without the use of ionizing radiation. During the MRI process, the patient is positioned on a motorized table that moves into a large cylindrical scanner, which houses a powerful magnet. The magnetic field generated by the scanner aligns the hydrogen atoms in the body. Subsequently, radiowaves are transmitted through this magnetic field, causing the protons in various tissues to emit specific radiofrequency signals. These signals are captured and processed by a computer, which constructs high-resolution tomographic images in three dimensions. In the context of CPT® Code 73220, the MRI is performed on the upper arm or other areas of the upper extremity, and it involves two phases: an initial imaging phase without the use of contrast material, followed by a second phase where contrast material is administered to enhance the visibility of certain structures. This dual-phase approach allows for a comprehensive assessment of the area in question, particularly useful in diagnosing conditions such as tendinitis, muscle atrophy, soft tissue lesions, osteomyelitis, and other abnormalities that may not be clearly visible through other imaging modalities like CT scans. The use of contrast material in the second phase aids in providing clearer images, which can be critical for accurate diagnosis and treatment planning.