CPT® Code 73718

Magnetic resonance imaging (MRI) is a sophisticated imaging technique utilized to visualize the internal structures of the body, particularly the lower extremities, excluding the 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 into this magnetic field, causing the protons within the hydrogen nuclei to emit specific radiofrequency signals. These signals are captured and processed by a computer, which constructs high-resolution, three-dimensional images of the scanned area. In the context of CPT® Code 73718, the MRI is specifically focused on the lower extremity, such as the upper or lower leg, and does not involve the use of contrast material. This is a critical distinction, as the absence of contrast differentiates it from other related codes, such as CPT® Code 73719, which involves the administration of iodine contrast dye, and CPT® Code 73720, which includes both non-contrast and contrast imaging. MRI scans are particularly valuable for diagnosing a variety of conditions, including injuries, trauma, and unexplained pain, as they provide clear images of soft tissues, muscles, and bones that may not be adequately visualized through other imaging modalities like CT scans. The detailed images produced by MRI can assist physicians in identifying issues such as tendinitis, muscle atrophy, soft tissue lesions, osteomyelitis, contusions, hematomas, and fractures, thereby facilitating accurate diagnosis and treatment planning.