B438Y0Z
Magnetic Resonance Imaging (MRI) Renal Arteries, Bilateral to None with Unenhanced and Enhanced, Other Contrast Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | B Imaging |
| Body System | 4 Lower Arteries |
| Operation | 3 Magnetic Resonance Imaging (MRI) |
| Body Part | 8 Renal Arteries, Bilateral |
| Approach | Y Other Contrast |
| Device | 0 Unenhanced and Enhanced |
| Qualifier | Z None |
Operation Definition
Computer reformatted digital display of multiplanar images developed from the capture of radiofrequency signals emitted by nuclei in a body site excited within a magnetic field
Procedure Overview
This family covers magnetic resonance angiography (MRA) of the arteries supplying the legs and pelvis, including vessels such as the aorta below the diaphragm, the iliac arteries, and the femoral, popliteal, and lower-leg arteries. Rather than using X-rays, the scanner uses a strong magnet and radio waves to build detailed cross-sectional and three-dimensional pictures of the vessel walls and the blood flowing through them. Physicians order it to look for narrowing (stenosis), blockages, aneurysms, or blood clots that could be starving the legs of oxygen-rich blood, a condition often called peripheral arterial disease.
Because it does not expose a patient to ionizing radiation, MRA is frequently chosen for people who need repeat imaging over time, such as those being watched after a vascular repair, or for patients with kidney concerns where iodinated CT contrast would be risky. Contrast agents used here are gadolinium-based rather than iodine-based, and some studies can even be performed without any contrast at all using specialized flow-sensitive sequences.
Anatomy & Axis Detail
Renal Arteries, Bilateral
Bilateral renal artery MRI images both main renal arteries and visualizes accessory vessels supplying either kidney, providing an alternative to CT for evaluating renovascular hypertension, fibromuscular dysplasia, or stenosis, particularly in patients with reduced renal function where iodinated contrast carries added risk. Gadolinium-based contrast used for MR angiography carries its own precautions in significant renal impairment, so protocols in this population may rely on non-contrast flow-sensitive sequences instead. As with CT, imaging both kidneys together supports direct comparison of vessel caliber and flow characteristics between the two sides, which is often the clinically relevant question, and accessory renal arteries should be identified explicitly since they affect both diagnostic interpretation and any subsequent surgical or interventional planning.
Contrast: Other Contrast
Other Contrast captures imaging studies using a contrast medium that is neither high- nor low-osmolar iodinated agent, such as barium sulfate for gastrointestinal studies or gadolinium-based agents for certain applications outside standard MRI classification within this axis. It is used when the contrast administered does not fit the osmolarity-based iodinated categories, distinguishing it from those specific classes and from studies performed with no contrast.
Qualifier: Unenhanced and Enhanced
Unenhanced and Enhanced specifies that an imaging study was performed both before and after administration of contrast material, allowing comparison between the two phases. This is common in studies evaluating enhancement patterns of lesions, such as certain CT or MRI protocols. It differs from None, which reflects a purely unenhanced study, and from single-agent contrast qualifiers used elsewhere.
Coding & Documentation
Coders should confirm from the radiology report exactly which named artery or arterial segment was studied, since the lower artery body system in this section is subdivided by specific vessel, and picking the wrong body part value is the most common error. The report should also make clear whether contrast was administered, since that determines the correct qualifier character; ambiguous documentation stating only "MRA of the leg" without contrast detail should prompt a query. Another frequent mistake is coding a combined pelvic-and-leg run-off study as a single vessel when the study actually covers multiple distinct arterial segments requiring separate codes.
Commonly Confused With
This family is easily confused with Lower Arteries Ultrasonography (B|4|4), but ultrasound uses sound waves for real-time flow assessment and is typically the first-line, lower-cost screening tool, while MRI provides static high-resolution anatomic detail better suited for surgical planning. It can also be confused with CT angiography of the lower arteries, which uses ionizing radiation and iodinated contrast rather than a magnetic field; the modality named in the report, not the clinical question being answered, is what separates the two.