The codes are for x-ray of the lumbosacral spine (2 or 3 views), and an MRI of the lumbar spine without contrast. Both are billable on the same date, if documentation supports that both were performed and medically necessary.
(Without seeing the documentation ,I can only speculate. However, a hypothetical example could be that the x-ray showed something concerning and an MRI was performed to diagnose (or rule out) a condition.)