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2025 CPT code 73721

Magnetic resonance imaging (MRI) of any joint of the lower extremity without contrast material.

This code represents the complete procedure, including both the technical and professional components. If only the professional interpretation is performed, modifier 26 should be appended. If only the technical component is performed, modifier TC should be appended. For bilateral procedures, the code can be reported twice with modifiers LT and RT, or with a single unit and modifier 50.

Modifiers such as 26 (professional component), TC (technical component), 50 (bilateral procedure), LT (left side), and RT (right side) may be applicable.

Medical necessity must be established for the MRI based on the patient's clinical symptoms, physical examination findings, and prior imaging results (if any). The documentation should clearly justify why the MRI is necessary for diagnosis or treatment planning.

The radiologist is responsible for supervising the technical performance of the MRI scan, interpreting the images, and generating a diagnostic report. They must ensure the patient is properly positioned and the images are of diagnostic quality. The radiologist analyzes the images for any abnormalities or pathologies within the joint and surrounding tissues.

In simple words: An MRI of a joint in your leg (like your hip, knee, ankle, or foot) is taken using a powerful magnet and radio waves. No special dye is used during the scan. This helps the doctor see the inside of your joint to figure out what's wrong.

This procedure involves using magnetic fields and radio waves to create detailed images of any joint in the lower extremity (e.g., hip, knee, ankle, foot) without the use of a contrast agent. The patient is positioned within the MRI scanner, and images are acquired in multiple planes to visualize the joint structures.

Example 1: A patient presents with chronic knee pain and swelling. An MRI of the knee without contrast is ordered to evaluate for internal derangement, such as a meniscus tear or ligament injury., A patient experiences sudden onset ankle pain after twisting their foot. An MRI of the ankle without contrast is requested to assess for fractures, sprains, or other soft tissue injuries., A patient with a history of hip osteoarthritis complains of worsening pain. An MRI of the hip without contrast is performed to evaluate the extent of cartilage damage and joint degeneration.

Documentation should include the patient's relevant medical history, the reason for the MRI, the specific joint examined, and the radiologist's interpretation of the images.

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