The following information appeared on, CMS.gov
The delay of the implementation of the AUC is over. Beginning January 1, 2022, providers who order an advanced diagnostic imaging service for a Medicare beneficiary will be required to consult a Clinical Decision Support Mechanism (CDSM) to gauge adherence to evidence-based criteria and report the consultation information to CMS via claims to avoid denial of payment.
A CMS certified CDSM advises the provider whether the imaging study adheres to Medicare criteria. Providers on the patient side who order an imaging study and the furnishing providers who actually do the imaging and interpret the results are the most affected by the AUC program.