On January 1, 2022, radiology practices and hospitals that perform certain imaging services for Medicare patients will be denied payment for those services unless they submit documentation that the ordering physician has consulted a Clinical Decision Support (CDS) system. This regulation was included a few years ago in Medicare rulemaking, but its effective date has been delayed several times. As of now, there is no reason to believe it will be postponed further, so practices that have not yet taken steps to install and implement a system have a narrow window of opportunity to get ready.