If the motion is denied, the presiding officer for discovery shall, after opportunity for hearing, require the party or deponent who made the motion or the party or attorney advising such a motion or both of them to pay to the commission the reasonable expenses incurred in opposing the motion, including attorneys' fees, unless the presiding officer for discovery finds that the making of the motion was substantially justified or that other circumstances make an award of expenses unjust.
If the motion is granted in part and denied in part, the presiding officer for discovery may apportion in a just manner the reasonable expenses incurred in relation to the motion.
Iowa Admin. Code r. 161-9.8