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Per ACA mandate, all health plans including Medicare must comply with CORE 360 Uniform Use of CARCs and RARCs (835) rule or CORE developed maximum set of CARC/RARC and CAGC combinations for a minimum set of 4 Business Scenarios. Medicare can use any code combination if the business scenario is not one of the 4 CORE defined business scenarios. With the 4 CORE defined business scenarios, Medicare must use the code combinations from the lists published by CAQH CORE.

The following resources are available to provide insight into the codes, visit CMS.gov.