myelogram coding question

If a patient with an intrathecal infusion pump undergoes a limited thoracolumbar myelogram to check the pump for malfunction, would it be appropriate to bill the procedure as a true myelogram (CPT 72255 - 72270) or would it be more appropriate to bill CPT 95999? According to the procedure note, " a small amount of contrast was injected through the catheter in the side access port of the pump. There were no leaks of dye through the entire length of the catheter and there was free flow of contrast seen from the tip of the catheter producing a limited thoracolumbar myelogram".

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