Wiki Medicare Mammogram Diagnosis Z12.31 or Z12.39

The hospital we sent our patient to sent us a notice that the Mammo diagnostic was ordered, not mammo screening and asked that we provide a different code. However both of those codes are for screening, so I am slightly confused. Thank you for any input you may have.
 
Is it possible that they are saying the order they received was for a diagnostic test, yet you provided only a screening diagnosis?
 
Yes, they said it was a diagnostic code not screening, so question now is Z12.3? That is the code I sent back to them, so hoping I did this right, thanks for your help
 
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