Does my enrollment in Medicaid affect my eligibility for Medicare?

If you have Medicaid, you should sign up for Part B. Medicare will be your primary and your Medicaid will be your secondary. In many states, Medicaid may be able to help pay your Medicare out-of-pocket costs (like deductibles, coinsurances, copayments, and even premiums) depending on the type of Medicaid you are enrolled in.