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Billing a Screening Mammography that Becomes a Diagnostic Mammography

Published on 

Wednesday, October 13, 2021

 | FAQ 

How do we bill mammography services when a beneficiary undergoes a screening and diagnostic mammogram on the same day?


According to the MLN educational tool: Medicare Preventive Services (, “if you perform and bill a screening mammogram and a diagnostic mammogram on the same day, use modifier -GG to show a screening mammography turned into a diagnostic mammography.”

Article Author: Beth Cobb, RN, BSN, ACM, CCDS
Beth Cobb, RN, BSN, ACM, CCDS, is the Manager of Clinical Analytics at Medical Management Plus, Inc. Beth has over twenty-five years of experience in healthcare including eleven years in Case Management at a large multi-facility health system. In her current position, Beth is a principle writer for MMP’s Wednesday@One weekly e-newsletter, an active member of our HIPAA Compliance Committee, MMP’s Education Department Program Director and co-developer of MMP’s proprietary Compliance Protection Assessment Tool.

This material was compiled to share information.  MMP, Inc. is not offering legal advice. Every reasonable effort has been taken to ensure the information is accurate and useful.