Companion Guides

CMS publishes a companion guide to supplement the implementation guide. The 5010A2 - Part A 837 Companion Guide offers specific 837I electronic claim loop and segment references for submitting Medicare Part B claims.

MACs also publish their own companion guides with more information specific to each MAC’s business. Visit the Medicare Fee-for-Service Companion Guides webpage to find your MAC’s Companion Guide.

Note: The implementation guides are technical documents, and providers may need help from software vendors or clearinghouses to interpret and implement the information within the guides.