In this add–on procedure, the provider injects a diagnostic or therapeutic agent into a facet joint, the joint connecting two spinal vertebrae together, at the lumbar or sacral level. Or he may perform the injection for nerves innervating that joint. He uses imaging guidance of either fluoroscopy or CT scan. The provider injects the second additional level, after an initial separately reportable injection. The goal of this procedure is to treat spinal pain or to identify the exact source of pain.
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