Neck (Cervical Spine) CT scan (with and without contrast)

What it is

Most cervical spine CT is done with no contrast at all, because the usual question — is a vertebra broken — is answered by bone detail alone. A smaller number are done with contrast, when soft tissue is the concern. This code is the least common of the three: both passes, in one sitting.

The reason to pay for both is the ambiguity that a single enhanced pass leaves behind. On CT, calcification, dense bone, surgical hardware, older blood and contrast-filled tissue can all look bright. If only the enhanced images exist, a bright area is uninterpretable — it might be enhancing, or it might be a fleck of calcium that was always there. The uninjected pass settles it by showing what the same spot looked like before the dye. That before-and-after comparison is the entire value of this code, and when the radiologist does not need it, one of the single-phase codes is used and the price is lower.

Why it is done

• To evaluate a mass in or beside the cervical spine where calcification inside it is itself a clue to what the mass is
• To assess a tumor in a vertebra, where the difference between dense bone and enhancing tissue has to be established
• To look for infection and any collection of pus around the spine, when distinguishing it from dense post-surgical change matters
• To examine a neck that has had previous surgery and contains hardware
• To characterize an abnormality found on another scan that could not be called enhancing or non-enhancing on the images available
• To image the neck when MRI cannot be used, for example because of an implanted device that is not MRI-safe

What to expect

You will be asked not to eat for a period beforehand, and asked about allergies and kidney function, because iodine contrast is cleared by the kidneys. An intravenous line goes into the arm. The first pass through the scanner takes seconds with nothing injected; then the contrast is given, and the table passes through again. Most people feel a spreading warmth and a metallic taste as the dye goes in, and both fade within a minute. The total appointment is usually short compared with MRI — often under half an hour — but there is radiation exposure, and doing two passes means more of it than a single-phase scan. You can eat and drive afterward as normal.

Questions worth asking

• Three cervical CT codes exist — without, with, and this one. Confirm which is on the order, because this is the priciest of the three and the two single-phase versions are frequently sufficient.
• Ask whether the contrast material is itemized separately from the scan.
• If a neck MRI is also being considered, ask whether both are really needed. Ordering both in the same episode means paying for both.
• Ask whether the radiologist's interpretation is billed by a separate group from the facility, and whether that group is in your network.
• If this follows a scan done elsewhere, ask whether the outside images can be imported for comparison rather than the prior phase being repeated here.