Carlos RC, et al. - Using patient-level analytic files between 2004 and 2014 from Clinformatics Data Mart (OptumInsight, Eden Prairie, Minnesota), researchers evaluated changes in screening mammography cost sharing and utilization before and after the Affordable Care Act (ACA) and the revised US Preventive Services Task Force (USPSTF) guidelines. In addition, they compared mammography cost sharing between women aged 40 to 49 and those 50 to 74. Participants in the study were women 40 to 74 years without a history of breast cancer or mastectomy. They identified 1,763,959 women from 40 to 74 years of age who were commercially insured. Comparing women between the ages of 40 and 49, 50 to 64 and 65 to 74, the proportion of women exposed to cost sharing has declined in all groups over time. Before the ACA, a substantial majority of commercially insured women had first-dollar coverage for mammography. Almost all women had access to zero cost-share mammography after ACA. Findings suggested that the lack of an increase in mammography use post-ACA could be partially attributed to a USPSTF guideline change, the high proportion of women without cost sharing prior to the ACA, and the relatively low levels of cost sharing prior to the policy implementation.