Medicaid Eligibility Explained: Who Qualifies and How the Program Works

What Is Medicaid and How Does It Work?

Medicaid is a government health insurance program that provides coverage to low-income individuals and families who might otherwise have no way to afford medical care. It is the single largest source of health coverage in the United States, serving more than 90 million people as of 2024.

Unlike Medicare, which is a federal program tied primarily to age and work history, Medicaid is a joint federal-state program. The federal government sets baseline rules and contributes a substantial share of the funding, but each state administers its own version of the program. That means the program goes by different names in different states — in California it's Medi-Cal; in Tennessee it's TennCare — and the rules for who qualifies can differ significantly depending on where you live.

At its core, Medicaid works by paying health care providers directly on behalf of eligible enrollees. Most people who qualify pay little or nothing out of pocket for covered services, though some states charge nominal copayments for certain visits. The program covers a broad range of services including doctor visits, hospital stays, prescription drugs, mental health treatment, long-term care, and preventive care.

Understanding Medicaid starts with recognizing that it is not a one-size-fits-all program. There are multiple eligibility pathways, each tied to a different category of people the program is designed to serve. Before diving into who qualifies, it helps to understand the basic framework: the federal government defines the minimum populations states must cover, and states have the option to expand coverage beyond those minimums — and most do, to varying degrees.

Who Is Eligible for Medicaid?

Medicaid eligibility is organized around specific groups of people, not just income alone. Even if your income is low, you generally need to fall into a recognized eligibility category to qualify — unless you live in a state that has adopted full ACA expansion for adults. The main groups the program serves are described below.

Children

Children from birth through age 18 (and sometimes 19 or 20, depending on the state) are the most consistently covered group across all states. Income thresholds for children are typically more generous than for adults. Many states cover children in households earning up to 200–300% of the federal poverty level through Medicaid or the related CHIP program. See our guide on Medicaid vs. CHIP to understand how these two programs differ for families.

Pregnant Women

Pregnant women are a federally mandated coverage group. States must cover pregnant women with incomes up to at least 138% of the federal poverty level, and many states set the threshold significantly higher — sometimes up to 200% or more. Coverage typically includes prenatal visits, labor and delivery, and 60 days of postpartum care (recently extended to 12 months in many states under a federal option).

Adults Under 65 (ACA Expansion Group)

In states that have adopted the Affordable Care Act's Medicaid expansion, low-income adults ages 19 to 64 who are not pregnant and do not have a disability can qualify for coverage based on income alone, up to 138% of the federal poverty level. This group did not historically have a Medicaid pathway before 2014. In non-expansion states, these adults often have no Medicaid option regardless of how low their income is.

Elderly Individuals (Age 65 and Older)

Seniors with low incomes and limited assets may qualify for Medicaid to help cover services that Medicare does not pay for — particularly long-term care in nursing facilities. For this group, eligibility often depends on both income and asset limits (what you own, not just what you earn). Many seniors who qualify for both programs are called dual eligibles. Learn more in our article on dual eligibility.

People with Disabilities

Individuals with qualifying physical or mental disabilities — as determined by Social Security standards — are eligible for Medicaid regardless of age. This includes people receiving Supplemental Security Income (SSI), who are automatically enrolled in Medicaid in most states. Eligibility for this group often involves separate income and asset tests rather than MAGI rules.

For a structured overview of all five major eligibility categories, see our reference guide to Medicaid's five core eligibility categories.

How Income Is Measured: MAGI and Other Rules

Once you've identified which eligibility category you might fall into, the next question is how Medicaid measures your income. The answer depends on which group you belong to.

MAGI-Based Income Rules

For most non-elderly, non-disabled adults and for children and pregnant women, Medicaid uses a measure called Modified Adjusted Gross Income, or MAGI. This is the same income calculation used in the ACA Marketplace, which makes it easier for families to navigate both programs simultaneously.

MAGI-based eligibility is calculated as a percentage of the federal poverty level (FPL). The FPL is updated each year and varies by household size — in 2024, it is $15,060 for a single person and $31,200 for a family of four. The table below shows common income thresholds used in Medicaid determinations:

It's important to note that MAGI does not count every dollar you receive. Certain income types — such as child support received, veterans' benefits, and worker's compensation — are excluded from the MAGI calculation. Your household size also matters significantly, because a higher household count raises the income threshold at which you remain eligible.

Asset and Resource Tests for Elderly and Disabled Applicants

Seniors and people with disabilities often face a different set of rules. In addition to income, states look at countable resources — things like bank accounts, investments, and property. The federal standard for SSI-linked Medicaid is $2,000 in countable assets for an individual ($3,000 for a couple), though states can and do vary these limits.

Not everything counts as a resource. Your primary home (in most circumstances), one vehicle, personal belongings, and certain burial funds are typically excluded. These rules can get complex quickly, particularly when it comes to long-term care eligibility and Medicaid estate recovery — topics worth exploring separately if they apply to your situation.

The ACA Expansion: How Eligibility Changed After 2014

Before the Affordable Care Act took effect in 2014, Medicaid was primarily available to specific groups: children, pregnant women, people with disabilities, and very low-income parents. Adults without children — even those living in deep poverty — had virtually no path to Medicaid coverage in most states.

The ACA changed this fundamentally by creating a new eligibility category: low-income adults under 65, regardless of family status or disability. The law originally required all states to expand Medicaid to cover this group at 138% FPL, with the federal government covering 100% of the costs for the first few years (now approximately 90% for expansion enrollees). However, a 2012 Supreme Court ruling made expansion optional for states.

As of mid-2024, 41 states and the District of Columbia have adopted the expansion. The remaining states — primarily in the South and parts of the Midwest — have not, leaving a gap in coverage for adults who earn too little to qualify for ACA Marketplace subsidies but too much to meet their state's traditional Medicaid rules. This gap disproportionately affects adults of working age in lower-wage jobs.

The practical effect of expansion is enormous. In expansion states, a single adult earning up to about $20,783 per year qualifies for full Medicaid coverage. In a non-expansion state, that same person may have no affordable coverage option at all. For a deeper look at how the ACA reshaped the program, see our article on the ACA's role in reshaping Medicaid eligibility.

It's also worth knowing that the ACA introduced continuous eligibility protections and new rules linking Medicaid and Marketplace enrollment, so that families who apply for one program can be seamlessly screened for the other. If your income fluctuates above the Medicaid threshold, you may qualify for subsidized Marketplace coverage instead. You can learn about enrollment windows in our guide to special enrollment.

Why Medicaid Rules Vary So Much by State

If you've spoken to someone in another state about Medicaid and found that their experience sounds entirely different from yours, you're not imagining things. The variation in Medicaid rules across states is one of the program's defining — and most confusing — features.

Here's why it happens: the federal government sets a floor, not a ceiling. States must cover certain populations and provide certain services to receive federal matching funds. But beyond those minimums, states have broad flexibility to set higher income thresholds, cover additional populations, add extra benefits, impose work requirements (where approved), or limit enrollment in other ways.

Examples of State Variation

• Income thresholds for children: Some states cover children up to 300% or even 400% of the FPL, while others stop at the federal minimum of 138%.
• Postpartum coverage: Many states have extended postpartum Medicaid to 12 months; others still cover only 60 days.
• Long-term care eligibility: Asset limits and income rules for nursing home coverage vary significantly across states.
• Work requirements: A handful of states have attempted to impose work requirements on certain adult enrollees, though legal challenges have limited these policies.
• Expansion status: As noted above, whether your state has expanded Medicaid is perhaps the single biggest variable in eligibility for working-age adults.

This variation means that eligibility is genuinely impossible to assess without knowing your state. Our article on Medicaid eligibility by state digs into these differences in detail and explains the political and historical reasons behind them.

One common misconception worth addressing here: Medicaid is not only for the unemployed, homeless, or people in crisis. Many enrollees are working adults, parents, and seniors who simply have incomes too low to afford private insurance. If you've assumed Medicaid wasn't for people like you, our article on common Medicaid misconceptions may change your perspective.

How to Apply for Medicaid

One significant advantage Medicaid has over many other programs is that you can apply at any time of year — there is no annual open enrollment window. If your circumstances change and you become eligible, you can apply immediately and coverage can often be backdated to the date of your application or earlier.

Ways to Apply

1. Online through your state Medicaid agency: Every state has an online portal for Medicaid applications. Search for your state's name plus "Medicaid application" to find the official site.
2. Through HealthCare.gov: If you're applying for Marketplace coverage, the site will automatically screen you for Medicaid eligibility and transfer your information to your state's Medicaid agency if you appear to qualify.
3. In person: You can visit your local Medicaid office, department of social services, or health department. Many states also allow applications through community health centers and hospitals.
4. By phone or mail: Most states maintain phone hotlines and accept paper applications for those who cannot apply online.

What You'll Need

Gather the following before you start your application:

• Proof of identity (driver's license, passport, or state ID)
• Social Security numbers for all household members applying
• Proof of income (recent pay stubs, tax returns, or a letter from an employer)
• Proof of residency (utility bill, lease agreement, or similar documents)
• Documentation of any disability or pregnancy, if applicable
• Immigration documents, if relevant to your household

After You Apply

Once you submit your application, your state must notify you of a decision within 45 days for most cases (90 days if a disability determination is required). If approved, you'll receive a Medicaid ID card and information about your coverage. If denied, you have the right to appeal the decision — and you should not hesitate to do so if you believe you were wrongly rejected.

Coverage under Medicaid is also typically comprehensive. To get a sense of what services most plans cover, explore our overview of what's covered by health insurance broadly. And if you want to understand how Medicaid compares to Medicare in terms of who each program serves, our guide to Medicare eligibility by part is a useful companion read.