Medicare is a federal program, not a state one. It is run by the Centers for Medicare & Medicaid Services (CMS), an agency within the U.S. Department of Health and Human Services, and every eligibility rule, benefit, and cost-sharing amount is set in federal law.1HHS.gov. What’s the Difference Between Medicare and Medicaid? Your Part A and Part B coverage looks the same whether you live in Alaska or Florida. States do have a limited role in a few adjacent areas — regulating Medigap policies and administering financial-assistance programs for low-income beneficiaries — but the core program is federal from top to bottom.
Why People Confuse Medicare With Medicaid
The names sit next to each other, and that is where most of the confusion starts. Medicare and Medicaid are structured very differently.
Medicare is entirely federal. One set of rules applies nationwide, and the program is funded and administered at the national level. Medicaid is a joint federal-and-state program: each state sets its own eligibility standards, decides which optional services to cover, and runs the program day to day using a mix of federal and state funds.1HHS.gov. What’s the Difference Between Medicare and Medicaid? That is why Medicaid benefits and income limits vary by state while Medicare benefits do not.
Medicare eligibility is based on age or disability, not income. Most people qualify at 65 regardless of what they earn. Medicaid is designed for people with limited income and resources. Some people qualify for both at once — “dual-eligible” beneficiaries — and Medicaid picks up Medicare premiums and out-of-pocket costs for them.
Who Actually Runs Medicare
CMS sets the rules, but it does not process every claim itself. It contracts with private insurance companies called Medicare Administrative Contractors (MACs) that handle claims in designated geographic regions.2eCFR. 42 CFR Part 421 Subpart E – Medicare Administrative Contractors (MACs) MACs pay providers and answer billing questions. They cannot change eligibility rules, alter benefits, or invent their own coverage policies. Every MAC follows the same federal guidelines.
Medicare comes in four parts, and the same federal control runs through all of them.3Medicare. Parts of Medicare Part A covers inpatient hospital care, skilled nursing, hospice, and some home health care. Part B covers doctor visits, outpatient care, preventive services, and durable medical equipment. Together, A and B are called Original Medicare and are administered directly by the federal government. Part C (Medicare Advantage) and Part D (prescription drugs) are delivered through private insurers, but those insurers must be CMS-approved and must follow rules CMS writes.
Appeals are federal too. If you disagree with a coverage decision, you go through a five-level process set by federal law: redetermination by the MAC, reconsideration by an independent contractor, a hearing before an administrative law judge, review by the Medicare Appeals Council, and finally judicial review in federal district court.4Centers for Medicare & Medicaid Services. Original Medicare (Fee-for-Service) Appeals The same ladder applies to every beneficiary in every state.
Where the Money Comes From
Medicare’s revenue is federal. No state budget contributes to it.5Medicare. How Is Medicare Funded?
The Hospital Insurance Trust Fund pays for Part A. Its main revenue is the FICA payroll tax: employees pay 1.45 percent of wages, employers match it, and self-employed workers pay the combined 2.9 percent themselves.6Office of the Law Revision Counsel. 26 U.S. Code 3101 – Rate of Tax High earners pay an additional 0.9 percent on wages above $200,000 (single), $250,000 (married filing jointly), or $125,000 (married filing separately), and employers do not match that piece.7Internal Revenue Service. Topic No. 560, Additional Medicare Tax
The Supplementary Medical Insurance Trust Fund pays for Parts B and D. About 75 percent comes from general federal revenue and about 25 percent from beneficiary premiums.5Medicare. How Is Medicare Funded? Those premiums go directly to the federal treasury. No state government collects them, holds them, or spends them.
Coverage Is the Same in Every State
Because Medicare is federal, a beneficiary in rural Montana has the same Part A and Part B benefit package as someone in downtown Chicago. Moving across state lines does not change your covered services, your deductibles, or your enrollment status. The legal foundation is Title XVIII of the Social Security Act, codified at 42 U.S.C. § 1395.8Office of the Law Revision Counsel. 42 U.S.C. 1395
Coverage also extends to U.S. territories. Puerto Rico, the U.S. Virgin Islands, Guam, the Northern Mariana Islands, and American Samoa are treated the same as the 50 states and Washington, D.C. for Medicare purposes.9Medicare. Travel Outside the U.S. Outside those areas, Medicare generally does not pay for your care.
Costs and provider availability still vary regionally. Medicare adjusts provider payment rates for local wage levels, and the number of doctors or hospitals near you depends on your area. Those are payment and market differences, not differences in what the program covers.
Eligibility Is Set by Federal Law
Who qualifies for Medicare is decided by federal statute. No state can add or remove eligibility categories. The main paths in:10Department of Health & Human Services. Who’s Eligible for Medicare?
- Age 65 or older, if you are a U.S. citizen or a permanent resident who has lived in the country for at least five consecutive years, and you or your spouse paid Medicare taxes for at least 10 years.
- Disability, after 24 consecutive months of Social Security Disability Insurance benefits.11Office of the Law Revision Counsel. 42 U.S. Code 426 – Entitlement to Hospital Insurance Benefits
- ALS, with coverage beginning as soon as SSDI starts.
- End-Stage Renal Disease, at any age, for people who need dialysis or a kidney transplant.
Enrollment periods are federal as well. Your Initial Enrollment Period is the seven-month window that begins three months before the month you turn 65 and ends three months after.12Medicare. When Does Medicare Coverage Start Late-enrollment penalties are also set by federal rule: Part B adds 10 percent to your monthly premium for every full 12-month period you were eligible but did not sign up, and Part D adds 1 percent of the national base beneficiary premium for each month you went without creditable drug coverage.13Medicare. Avoid Late Enrollment Penalties The same numbers apply everywhere.
Where States Actually Have a Role
A few pieces of the Medicare experience are shaped by state authority. They sit around Medicare rather than inside it, but they affect what you pay and what is available to you.
Medigap Regulation
Medigap policies are private plans that help cover out-of-pocket costs Original Medicare leaves behind, such as copayments, coinsurance, and deductibles. Federal law standardizes the plan letters, so a Plan G in one state covers the same benefits as a Plan G in another.14Office of the Law Revision Counsel. 42 U.S. Code 1395ss – Certification of Medicare Supplemental Health Insurance Policies
State insurance departments, though, regulate pricing, sales, and consumer protections. That is why premiums for the same lettered plan can differ sharply from state to state, and why the rules on switching plans without medical underwriting are not identical everywhere. Federal law guarantees a one-time, six-month open enrollment window starting when you turn 65 and enroll in Part B, during which insurers cannot deny you coverage or charge more based on health history. Some states go further, with annual guaranteed-issue periods or rules that prevent insurers from raising your premium as you age. Others stick to the federal floor. This is the clearest example of state-level variation inside the Medicare system.
Medicare Advantage Plan Availability
Medicare Advantage plans are approved and regulated by CMS. Federal law preempts most state regulation of these plans, though states still license the insurers offering them and oversee their financial solvency.15eCFR. 42 CFR Part 422 – Medicare Advantage Program Private insurers pick which counties to serve, so plan choice varies by location. Urban areas often have dozens of options; some rural counties have very few, or none.
Medicare Savings Programs
Medicare Savings Programs (MSPs) are the place federal and state roles most clearly intersect. MSPs use Medicaid funds — jointly paid for by federal and state governments — to help low-income Medicare beneficiaries with premiums, deductibles, and coinsurance. States administer the programs and run the applications, while federal law sets minimum income and resource thresholds.16Medicare. Medicare Savings Programs There are four:
- Qualified Medicare Beneficiary (QMB), covering Part A and Part B premiums plus Medicare deductibles, coinsurance, and copayments.
- Specified Low-Income Medicare Beneficiary (SLMB), covering the Part B premium only.
- Qualifying Individual (QI), covering the Part B premium only.
- Qualified Disabled Working Individual (QDWI), covering the Part A premium for certain people under 65 with disabilities who have returned to work.
Providers cannot bill QMB enrollees for Medicare cost-sharing, even if the provider does not participate in Medicaid.17Centers for Medicare & Medicaid Services. Beneficiaries Dually Eligible for Medicare and Medicaid You apply for MSPs through your state Medicaid office, not through Medicare.
Local Help Navigating the Federal Program
The federal government funds State Health Insurance Assistance Programs (SHIPs) that give free, one-on-one guidance on Medicare choices. Nationally, SHIP operates through more than 2,200 local sites staffed by over 12,500 trained counselors and volunteers.18ACL Administration for Community Living. State Health Insurance Assistance Program (SHIP) SHIP is federally funded but delivered through state-level offices, so you contact the SHIP in your state for personalized help with choosing between Original Medicare and Medicare Advantage, comparing Medigap policies, or applying for financial assistance.
The bottom line: Medicare itself is federal. The rules, the money, the eligibility, and the benefits all come from Washington. States shape a few things around the edges — mainly Medigap pricing rules, Medicare Advantage plan availability through licensing, and the delivery of Medicare Savings Programs — but they cannot change what Medicare covers or who qualifies for it.