Marketplace vs. Medicaid vs. Medicare
Three programs cover most Americans, and they are easy to confuse because they all involve health insurance, government rules, and enrollment windows. They are for different people, they pay differently, and moving between them at the wrong time can leave you uninsured or paying for two plans. The Marketplace application sorts you into the right one, but understanding the sorting in advance stops surprises.
The three programs, in one paragraph
The Marketplace is where people without affordable job-based coverage, Medicare, or Medicaid buy private insurance, usually with a premium tax credit. Medicaid is a joint federal-state program for people with low incomes, with eligibility set by each state within federal rules. Medicare is a federal program mainly for people aged 65 and over, and for some younger people with disabilities or end-stage renal disease. Age points you toward Medicare, income points you toward Medicaid, and the absence of either points you toward the Marketplace.
| Marketplace | Medicaid | Medicare | |
|---|---|---|---|
| Who it is for | People without affordable job coverage, Medicare, or Medicaid | People with low incomes, under state rules | People 65 and over, and some people with disabilities |
| Who runs it | Federal or state exchange, private insurers provide plans | State, within federal rules | Federal government, with private Medicare Advantage and Part D plans as options |
| Cost to you | Premium minus tax credit, plus cost-sharing | Usually little or no premium, low or no cost-sharing | Premiums, deductibles, and coinsurance vary by part; many buy supplemental coverage |
| When you enroll | Open enrollment, or special enrollment after a life event | Any time of year, if eligible | Initial enrollment around 65, annual open enrollment, and special periods |
Medicaid: income-based, state by state
Medicaid eligibility is set by your state. In states that expanded Medicaid under the Affordable Care Act, adults with incomes up to 138% of the federal poverty level generally qualify. In states that have not expanded, eligibility for non-disabled, non-pregnant adults can be far narrower, and some people fall into the coverage gap described in the subsidies guide: too poor for a Marketplace credit, but not eligible for Medicaid. Children, pregnant women, parents, and people with disabilities have their own eligibility categories in every state, with higher income limits than the adult expansion limit in many cases. Medicaid has no open enrollment season: if you qualify, you can enroll at any time, and you can be moved between Medicaid and the Marketplace when your income changes, through the same application.
Medicare: age-based, with its own windows
Medicare starts, for most people, at 65. Your initial enrollment period runs for seven months: the three months before your 65th birthday month, your birthday month, and the three months after it. Enrolling late can mean a permanent late-enrollment penalty for Part B and Part D, and a gap in coverage, so the transition from the Marketplace to Medicare deserves planning, not improvisation. When you become eligible for Medicare, you generally lose eligibility for Marketplace premium tax credits, even if you keep the Marketplace plan, so keeping both and paying both is usually a mistake. The Marketplace application and the Social Security Administration both have transition information, and the month you turn 65 is the month to use it.
When you switch, and in which direction
Marketplace to Medicaid. If your income falls, or you move to a state with broader eligibility, the application can move you to Medicaid, and Medicaid coverage can be retroactive in some states. Report the income change promptly rather than waiting for tax time.
Marketplace to Medicare. Plan the switch around your 65th birthday. Enroll in Medicare during your initial enrollment period, and end the Marketplace plan when Medicare starts, so you are not paying for a plan you cannot get a credit for.
Medicaid to Marketplace. If your income rises above your state's Medicaid limit, losing Medicaid is a qualifying life event that opens a 60-day Marketplace special enrollment period. Do not wait for open enrollment.
Job coverage to any of the three. Gaining or losing a job can move you in any direction, and each move has its own window. The application sorts you, but only if you report the change.
Sources: HealthCare.gov, Medicaid, Medicare, and Marketplace comparison pages; Centers for Medicare & Medicaid Services, Medicaid eligibility and Medicare enrollment guidance; Social Security Administration, Medicare enrollment periods.