Code for Pre-MRI or CT Blood Work?

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Anyone know of a diagnosis code that could be used for a patient getting blood work for kidney function prior to an MRI or CT with contrast?

We were looking at a couple of codes, but I am unsure if these would be appropriate. In the past we have used the diagnosis for the MRI / CT scan as the diagnosis for the kidney function tests as well.

Thanks
 
Did you ever find your answer? We are having that discussion too right now, some say z01.812/818 and the others are for Z13.89? I would like to have this clarified also.
 
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