HCPCS Level II code C8931 describes a magnetic resonance angiography (MRA) procedure with intravenous contrast focused on the spinal canal and its contents, a diagnostic imaging service performed to visualize vascular structures within the spine; the service type is contrast-enhanced spinal MR angiography and the typical site of service is an outpatient imaging center or hospital radiology department where MR angiography studies are performed using MRI scanners with contrast administration.