If you have Medicare and other health insurance or coverage, each type of coverage is called a “payer.” When there’s more than one payer, “coordination of benefits” rules decide which one pays first. The “primary payer” pays what it owes on your bills first, and then sends the rest to the “secondary payer” to pay. In some cases, there may also be a third payer. Read the article from Medicare.gov: https://www.medicare.gov/supplement-other-insurance/how-medicare-works-with-other-insurance/how-medicare-works-with-other-insurance.html#1358
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