Medicaid vs. CHIP: Understanding Coverage for Children and Families

What Medicaid and CHIP Actually Are

Both Medicaid and the Children's Health Insurance Program (CHIP) are government-funded health coverage programs, but they were created at different times and serve overlapping — yet distinct — populations. Understanding the difference isn't just an academic exercise: it determines which program your child qualifies for, what it costs, and what benefits you can expect.

Medicaid was established in 1965 as part of the Social Security Act. It is a joint federal-state program that provides free or low-cost health coverage to people with very low incomes, including children, pregnant women, adults, the elderly, and people with disabilities. The federal government sets minimum standards, and states administer the program with flexibility to expand eligibility and benefits beyond those minimums. For a full breakdown of who qualifies across all population groups, see Medicaid's five core eligibility categories.

CHIP was created in 1997 to address a gap: families who earned too much to qualify for Medicaid but couldn't afford private health insurance. CHIP is specifically designed for children (and in some states, pregnant women and parents), and it operates with more flexibility than Medicaid in terms of cost-sharing. States can run CHIP as an expansion of Medicaid, as a separate program, or as a combination of both.

In practical terms, these two programs form a continuum. A child at 100% of the Federal Poverty Level likely qualifies for Medicaid. A child at 220% FPL likely qualifies for CHIP. The line between them depends entirely on your state.

It is also worth noting that both programs allow year-round enrollment — unlike Marketplace plans, there is no annual open enrollment window. If your child qualifies today, you can enroll today. For more on how this works, Medicaid and CHIP enrollment rules are explained in detail here.

Eligibility Rules: Where Medicaid and CHIP Diverge

The most important difference between Medicaid and CHIP is the income threshold at which each program kicks in. Both programs measure eligibility using the FPL — a federal benchmark updated annually that reflects household size and income. Here is how the structure typically works:

• Medicaid for children: Federal law requires states to cover children up to at least 133% FPL (effectively 138% with the standard 5% income disregard). Most states cover children at significantly higher levels — some up to 200% or even 300% FPL — through Medicaid expansion rules specific to children.
• CHIP: CHIP covers children who fall above the state's Medicaid threshold but below the CHIP upper income limit, which varies widely by state. The national average upper limit for CHIP is around 255% FPL, but some states extend it to 400% or higher.

To illustrate: in a state where Medicaid covers children up to 200% FPL and CHIP covers children from 200% to 300% FPL, a family of four earning $60,000 per year (roughly 220% FPL in 2024) would find their children in CHIP, not Medicaid.

Beyond income, there are other eligibility factors to understand:

Citizenship and immigration status

Both Medicaid and CHIP require children to be U.S. citizens or qualify as lawfully present immigrants. However, states have the option to use their own funds (without federal matching) to cover children regardless of immigration status, and several states have exercised this option.

Residency

Children must live in the state where they apply. There is no minimum residency period — a family that just moved to a new state can apply immediately.

Age

CHIP covers children under age 19. Medicaid also covers children under 19 through the child eligibility pathway, though adults have separate Medicaid eligibility rules.

Because state rules vary so dramatically, your ZIP code can be as important as your income. Medicaid eligibility by state varies for specific reasons to understand the policy forces driving these differences.

Cost Differences: Premiums, Copays, and Out-of-Pocket Limits

One of the clearest practical differences between Medicaid and CHIP is what families are expected to pay out of pocket. Federal rules set different floors for each program.

For Medicaid, federal law prohibits charging premiums or enrollment fees to children in families below 150% FPL. For children between 150% and 200% FPL, states may charge nominal premiums, but cost-sharing is tightly capped. In practice, most children enrolled in Medicaid pay nothing or very little — no deductibles, no premiums, and minimal copays (often $0–$3 per service).

For CHIP, states have more latitude. Federal rules allow states to charge premiums and cost-sharing, subject to a cap: the total annual cost-sharing for a family cannot exceed 5% of family income. In practice, CHIP premiums for a child might range from $0 in low-income brackets to $50–$100 per month in higher income brackets, depending on the state. Copays for doctor visits and prescriptions are common but typically modest.

This cost difference matters when you're budgeting. A family enrolled in CHIP should review the state's specific fee schedule — which is publicly available on every state Medicaid/CHIP agency website — before assuming coverage is free. If cost-sharing feels burdensome, it is worth checking whether your child might qualify for Medicaid, which typically has fewer fees. The full breakdown of premiums and deductibles can help you evaluate what different coverage tiers actually cost your household.

Benefits: What Each Program Covers

Both Medicaid and CHIP must cover a comprehensive package of pediatric benefits. For children enrolled in Medicaid, this is governed by the Early and Periodic Screening, Diagnostic and Treatment (EPSDT) benefit — one of the most comprehensive coverage mandates in any public health program.

EPSDT requires states to provide:

• Well-child visits and developmental screenings at regular intervals
• Immunizations
• Dental care (preventive and restorative)
• Vision exams and corrective lenses
• Hearing tests and hearing aids
• Mental health and behavioral health services
• Any medically necessary treatment identified during a screening, even if it is not a service typically covered under the state's Medicaid plan for adults

That last point is significant. Under EPSDT, if a screening identifies a need, Medicaid must cover treatment — even if the service wouldn't normally be covered. This makes Medicaid's child benefit unusually comprehensive.

CHIP benefits must be at least equivalent to one of several benchmark coverage options: the Federal Employee Health Benefits Program's standard option, a state employee health plan, the largest commercial HMO in the state, or a state-designed package approved by the Secretary of Health and Human Services. This means CHIP benefits are robust — comparable to employer-sponsored coverage — but they are not required to meet the same unlimited-medically-necessary standard that EPSDT imposes on Medicaid.

In both programs, pediatric dental, vision, and hearing are covered by federal mandate for children — a protection that does not automatically apply to adults in Marketplace plans. For a full picture of what children are legally entitled to receive, see pediatric services covered by law. And for a general overview of what's covered in public and private health plans, the What's Covered hub provides a comprehensive reference.

How Families Span Both Programs — and the Marketplace

One of the most common sources of confusion is that different members of the same household may qualify for different programs. This is normal and expected — and the system is specifically designed to accommodate it.

Consider a family of four with two children:

1. The children may qualify for Medicaid or CHIP based on the household's income relative to the FPL.
2. A parent who is pregnant may qualify for Medicaid at a higher income threshold than a non-pregnant adult. Medicaid coverage for pregnant women works differently in terms of income limits and what is covered.
3. Non-pregnant parents may qualify for Medicaid in expansion states (where Medicaid extends to adults up to 138% FPL) or may need to obtain coverage through a Marketplace plan.

This layered coverage situation — children on CHIP, a parent on Medicaid, another parent on a Marketplace plan — is more common than many people realize. Families split across CHIP, Medicaid, and the Marketplace when enrolling through Healthcare.gov or a state exchange.

When you apply through your state's Medicaid agency or through Healthcare.gov, the system automatically screens all household members for both Medicaid and CHIP eligibility. You do not need to apply separately for each program. If a child is found ineligible for Medicaid, they are automatically evaluated for CHIP. This single-application process reduces the burden on families significantly.

Income changes can also shift a child's eligibility over time. If family income rises above the CHIP threshold mid-year, the child may lose CHIP eligibility and need to transition to a Marketplace plan — but a special enrollment period applies. Conversely, if income drops, a child may move from CHIP to Medicaid. Both changes trigger specific enrollment protections. For a broader look at how eligibility works across all Medicaid populations, Medicaid eligibility explained in full provides essential context.

Applying for Medicaid or CHIP: A Step-by-Step Overview

Applying for Medicaid or CHIP is simpler than many families expect, especially because the two programs share an application pathway in most states. Here is how the process works:

Step 1: Gather Your Documents

Before applying, collect the following for each household member:

• Proof of identity (birth certificate, passport, or state ID)
• Proof of citizenship or lawful immigration status
• Proof of state residency (utility bill, lease, or similar)
• Recent pay stubs, tax returns, or other income documentation
• Social Security numbers for all U.S. citizen household members applying

Step 2: Choose Your Application Channel

You can apply through three main channels:

• Healthcare.gov (or your state's own exchange, if your state operates one): The federal or state marketplace will screen your application for both Medicaid and CHIP eligibility automatically.
• Your state Medicaid agency directly: Every state has a Medicaid agency with its own application portal and in-person offices.
• By phone or in person: Call 1-800-318-2596 (the federal helpline) or visit a local social services office for assisted enrollment.

Step 3: Complete the Application

The application asks for household size, income from all sources, and basic demographic information. Answer for all household members, even those who may not qualify — the system needs the full household picture to calculate eligibility accurately.

Step 4: Respond to Verification Requests

Some applications are verified automatically against federal data (IRS, Social Security Administration). Others require you to submit supporting documents. Respond promptly — delays in documentation can delay coverage start dates.

Step 5: Enroll and Use Your Coverage

Once approved, you will receive a Medicaid or CHIP ID card. In most states, children are enrolled in a managed care plan, meaning they will choose (or be assigned) a primary care provider network. Understanding how managed care differs from traditional fee-for-service Medicaid is important for navigating your benefits — Medicaid managed care vs. fee-for-service explained for what to expect.

Finally, remember that neither Medicaid nor CHIP has a fixed open enrollment window. If your child loses other coverage, experiences a change in household income, or simply was never enrolled, you can apply at any time of year. Full Medicaid eligibility guidance can help you confirm whether your family qualifies before you apply.