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Medicare Billing: CMS-1500 & 837P

Companion Guides

CMS-approved MAC Companion Guides provide MAC-specific electronic claim loop and segments references for submitting Medicare Part B claims. Find your MAC’s website or review the Medicare Fee-for-Service Companion Guides webpage to find your companion guide.

Implementation and companion guides are technical documents. Billing agencies, clearinghouses, or software vendors can help you interpret and implement information within the guides.