Screening Mammogram and Dexa

Hi,

Someone from another office said that when a patient is having a mammogram

and another exam on the same encounter, that the screening mammogram

should be listed first and then any other codes secondary. What I have read in the guidelines stated, "You may use screening codes as either primary or secondary depending on the reason for the encounter". So if the reason for

the encounter is for a screening mammogram and a Dexa, does it matter which icd9 code is listed first?

Thanks,

Melody

Screening Mammogram and Dexa