How Medicaid Works: Federal Rules and State Control

Medicaid is federal money run by each state differently

Medicaid is a federal program, but it does not work the way most federal programs do. The federal government funds it, sets minimum rules, and requires states to participate—but each state designs and runs its own Medicaid program. This means the income limits, covered services, and enrollment rules vary significantly from state to state. A person who qualifies in one state may not may have access to in another, and a service covered in one state may not be covered in the next.

The federal government pays a share of each state's Medicaid costs—usually between 50 and 75 percent, depending on the state's wealth. States pay the rest and decide how to structure their programs within federal guidelines. This split funding and shared control is why Medicaid is sometimes called a "federal-state partnership."

Key Takeaways

Medicaid is funded by federal tax dollars but administered by each state, so rules and coverage differ by location.
The federal government sets a floor—minimum income thresholds and covered services—but states can be more generous.
Income limits, asset limits, and what services are covered depend entirely on which state you live in.
You explore through your state's Medicaid office or health department, not through a federal agency.
Some states expanded Medicaid under the Affordable Care Act and others did not, creating major differences in who qualifies.

What the federal government controls

The federal government sets the basic structure and minimum standards for Medicaid. It requires all states to cover certain groups—children, pregnant people, parents of dependent children, elderly people, and people with disabilities—up to certain income thresholds. It also requires coverage of certain services: hospital care, doctor visits, lab work, X-rays, nursing home care, and home health services.

Federal law also sets rules about how states must process applications, how they handle appeals, and how they protect patient privacy. The Centers for Medicare & Medicaid Services (CMS), a federal agency, monitors state programs to make sure they follow these rules.

What each state controls

Within the federal framework, states have broad power to set their own rules. A state can set its income limit higher than the federal minimum—or exactly at the minimum. A state can cover services the federal government does not require, such as dental care, vision care, or mental health counseling. A state can also set asset limits (how much money or property you can own and still may have access to), decide which doctors and hospitals participate, and set payment rates to providers.

States also decide whether to expand Medicaid under the Affordable Care Act. The ACA allowed states to extend Medicaid to adults earning up to 138 percent of the federal poverty level. As of 2024, about 38 states have done so, but 12 have not. In non-expansion states, childless adults and many parents earn too much to may have access to even if they are poor by most standards.

How to find your state's specific rules

Because Medicaid rules vary by state, you need to check your own state's program. Your state's Medicaid office is usually part of the health department or social services department. You can find it by searching "[your state] Medicaid" or by calling 211, a free helpline that connects you to local health and human services programs.

Your state's Medicaid website will show the current income limits, asset limits, covered services, and how the process works. Many states now use a single online portal for Medicaid and other benefits. Some states use private contractors to run parts of their Medicaid programs, so the website may direct you to a separate process site.

Why Medicaid rules differ so much between states

The federal-state partnership means that Medicaid reflects both national policy and local politics. When Congress passes a law affecting Medicaid, states must follow it—but Congress often gives states choices about how to implement it. The Affordable Care Act's Medicaid expansion is the clearest example: the federal government offered to pay for it, but left the decision to each state. States that expanded Medicaid cover millions more people than states that did not.

States also have different budgets and different priorities. A wealthy state may cover more services and set higher income limits. A state facing budget pressure may cover only the federal minimum. Over time, these choices compound, so Medicaid in one state can look very different from Medicaid in another.

What happens if you move to a different state

If you are on Medicaid and move to another state, your coverage does not automatically transfer. You must explore for Medicaid in your new state using that state's rules and income limits. Your old state's Medicaid ends on the date you move (or shortly after, depending on the state). You should explore in your new state as soon as you move to avoid a gap in coverage.

Some states have reciprocal agreements or streamlined processes for people moving from other states, but most do not. You will need to provide proof of residency, income, and citizenship or immigration status to your new state's Medicaid office. If you are moving to a state with stricter rules, you may lose coverage even if you may have access to in your old state.

Federal oversight and state accountability

Although states run Medicaid day-to-day, the federal government audits state programs and can penalize states that do not follow federal rules. CMS reviews how states process applications, whether they pay providers on time, and whether they protect beneficiary rights. If a state violates federal law, CMS can reduce federal funding or require the state to fix the problem.

States also report data to the federal government about how many people are enrolled, what services they use, and how much the program costs. This data helps Congress and CMS understand how Medicaid is working and whether changes are needed.

Frequently Asked Questions

Is Medicaid the same in every state?

No. Medicaid is federal money with federal minimum rules, but each state sets its own income limits, asset limits, and covered services. You must check your specific state's rules to know whether you may have access to and what is covered.

Can the federal government change Medicaid rules for my state?

Yes. Congress can pass laws that change Medicaid nationwide. The federal government can also issue rules through CMS that all states must follow. However, states often have some choice in how they implement federal changes.

What if my state's Medicaid rules are unfair?

You can file a complaint with your state's Medicaid office or with CMS. You also have the right to appeal if your process is denied. Some legal aid organizations and patient advocacy groups also challenge state Medicaid rules in court if they believe they violate federal law.

Does Medicaid cover the same doctors and hospitals everywhere?

No. Each state's Medicaid program contracts with different doctors, hospitals, and clinics. The providers who accept Medicaid in one state may not accept it in another. You should check your state's Medicaid website to find in-network providers near you.

If I may have access to in one state, will I may have access to in another?

Not necessarily. Income limits and rules differ by state. You may may have access to in a state with higher limits but not in a state with lower limits. You must explore using your new state's rules if you move.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.