Radiology Coding Alert

Question:What is the proper way to use modifier GG? Do I append it to a diagnostic mammogram code? Do we need a separate order for the diagnostic exam?Illinois SubscriberAnswer:You should report both the screening and diagnostic exams. Append modifier GG (Performance and payment of a screening mammogram and diagnostic mammogram on the same patient, same day) to the diagnostic mammogram code. You will not need an order for the diagnostic exam in this case.Example: A patient presents for a screening mammogram. The radiologist detects a suspicious abnormality requiring further imaging and performs a separate unilateral diagnostic mammogram on the same date. On the claim, report the following:77057 -- Screening mammography, bilateral (2-view film study of each breast)77055-GG -- Mammography; unilateral.Or if the mammograms are digital, use the following codes:G0202 -- Screening mammography, producing direct digital image, bilateral, all viewsG0206-GG -- Diagnostic mammography, producing direct digital image, unilateral, all views.Payer preference: G codes are appropriate [...]