B52F1ZZ
Computerized Tomography (CT Scan) Pelvic (Iliac) Veins, Right to None with None, Low Osmolar Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | B Imaging |
| Body System | 5 Veins |
| Operation | 2 Computerized Tomography (CT Scan) |
| Body Part | F Pelvic (Iliac) Veins, Right |
| Approach | 1 Low Osmolar |
| Device | Z None |
| Qualifier | Z None |
Operation Definition
Computer reformatted digital display of multiplanar images developed from the capture of multiple exposures of external ionizing radiation
Procedure Overview
This family covers computed tomography imaging of the venous system, in which a scanner rotates around the patient capturing many individual X-ray exposures that a computer reconstructs into detailed cross-sectional and three-dimensional images. Known clinically as CT venography, it is typically performed after an intravenous injection of iodinated contrast timed to opacify the veins of interest, whether in the legs, pelvis, abdomen, chest, or neck.
Physicians order it to detect deep vein thrombosis, particularly in body regions that are hard to evaluate with ultrasound such as the pelvic or abdominal veins, to investigate suspected venous compression syndromes, or to map venous anatomy before surgery or a device placement. Its ability to produce fast, high-resolution images across a large body region makes it especially useful in urgent evaluations and in patients whose body habitus limits ultrasound quality.
Anatomy & Axis Detail
Pelvic (Iliac) Veins, Right
The right pelvic, or iliac, veins carry blood from the right lower limb and pelvic organs upward to join the inferior vena cava, running alongside the right common, external, and internal iliac arteries. CT imaging of this segment is most often ordered to evaluate suspected deep venous thrombosis extending above the inguinal ligament, to assess May-Thurne syndrome in which the right iliac artery compresses the left vein, or to stage pelvic malignancy encroaching on the venous wall. Documentation should specify laterality since the right side is coded separately from the left, and the study is generally performed with contrast during the venous phase to opacify the vessel adequately, given its deep retroperitoneal location adjacent to bowel loops and the sacroiliac joint.
Contrast: Low Osmolar
Low Osmolar denotes use of a low-osmolar iodinated contrast agent during an imaging study, the class most commonly used in modern radiographic and CT imaging because it better approximates the osmolality of blood and carries a lower risk of reaction than High Osmolar media. This value distinguishes studies performed with this now-standard contrast type from those using older high-osmolar agents or no contrast at all.
Coding & Documentation
Accurate coding depends on the report clearly naming the venous structure or region examined, since the body part value is vessel-specific and studies covering multiple regions, such as combined pelvic and lower extremity venography, may require more than one code. Coders must confirm from the documentation whether contrast was administered and select the qualifier accordingly, and should watch for reports that describe a combined CT arteriogram and venogram performed in one session, which requires separate codes for the arterial and venous components rather than a single entry. Another pitfall is coding a CT scan that only incidentally shows a vein, rather than one performed specifically to evaluate venous anatomy, as a dedicated venography study.