Who Is Eligible for Medicare?

Most Americans become eligible for Medicare at age 65, but age is not the only way to qualify. Some people qualify earlier because of disability, ALS, or end-stage renal disease.

Eligibility also differs from automatic enrollment: you may qualify for Medicare but still need to apply.

Who qualifies at age 65?

Medicare generally serves people who are 65 or older and meet applicable U.S. citizenship or lawful-residency requirements. Many qualify for premium-free Part A based on their own Medicare-covered employment or qualifying work by a spouse.

People who do not meet the work-history requirement may still be eligible to buy Part A if they meet the other rules.

Do not confuse premium-free Part A eligibility with Medicare eligibility overall. Even if you must pay a Part A premium, you may still qualify for Medicare.

Part B generally has a monthly premium regardless of your work history.

What does the 40-quarter rule mean?

A common path to premium-free Part A is earning approximately 40 quarters of Medicare-covered work, often described as ten years. Certain spouse, former-spouse, or survivor situations can also establish eligibility under Social Security rules.

Your personal circumstances determine whether another person's work record can help.

If you are unsure whether you have enough work credits, contact Social Security. A private insurance agent cannot change your federal eligibility determination, and it is better to confirm work history before assuming you need to pay for Part A.

Medicare eligibility before age 65

Some people become eligible for Medicare after receiving Social Security Disability Insurance benefits for 24 months. People with amyotrophic lateral sclerosis, also called ALS, generally become eligible for Medicare when disability benefits begin, without the usual 24-month wait.

People with end-stage renal disease may qualify based on dialysis or a kidney transplant, but their enrollment and effective-date rules are more specialized. Eligibility may also depend on work-history requirements.

If ESRD applies to you, review the official Medicare guidance rather than assuming the standard age-65 timetable applies.

Does everyone get enrolled automatically?

No. Many people already receiving Social Security retirement benefits are automatically enrolled in Parts A and B when they reach 65.

People who are not receiving those benefits generally need to apply. Some disability-related enrollments occur automatically, but ESRD may require a separate application.

Always verify your Medicare card and effective dates. A person who qualifies for Medicare but has not completed required enrollment steps may have no coverage for care received before their effective date.

What if you are still working?

You can be eligible for Medicare while covered by employer insurance. Whether you should enroll in Part B immediately depends on whether your insurance is based on current employment, the employer's size, and which plan pays first.

Delaying Part B without qualifying protection can lead to penalties and gaps.

COBRA, retiree coverage, and Marketplace coverage are not equivalent to active-employment group coverage for all Medicare enrollment rules. Ask the employer benefits administrator and Social Security how your specific coverage coordinates with Medicare.

Eligibility for Medicare Advantage, Part D, and Medigap

To enroll in Medicare Advantage, you generally must have both Parts A and B and live in the plan's service area.

Standalone Part D eligibility generally requires entitlement to Part A or enrollment in Part B, along with residence in the plan's service area.

Medigap is private insurance designed to work with Original Medicare. You generally need Parts A and B to buy a policy.

Federal Medigap open enrollment protections usually begin when you are 65 or older and enrolled in Part B.

Texas has additional rules relevant to some people eligible for Medicare under age 65, so review current state requirements if that applies to you.

See how Medicare Supplement insurance works in Texas once you have Parts A and B.

Help for Texans with limited income

Medicare eligibility does not automatically mean you can afford all the premiums and cost-sharing. Medicare Savings Programs can help qualifying people pay certain Medicare costs, and Extra Help can lower Part D prescription expenses.

Eligibility depends on program-specific income, resource, and other rules.

Texas residents can explore assistance through YourTexasBenefits and the Texas Health Information, Counseling and Advocacy Program, which offers Medicare counseling. These programs are separate from deciding whether you qualify for Medicare itself.

Citizenship and residency requirements

For people enrolling at 65, Medicare eligibility generally requires U.S. citizenship or qualifying lawful permanent residence. Lawful permanent residents typically must meet a continuous U.S. residence requirement, and the specific eligibility and premium rules can be complicated.

Someone who has recently moved to Texas from another country should not assume that turning 65 automatically creates Medicare coverage. Contact Social Security for an individual determination.

Medicare eligibility is separate from eligibility for Medicaid or Affordable Care Act Marketplace subsidies. These programs have different rules and application processes.

Review Social Security's Medicare information to understand how to apply.

How Medicare and disability benefits connect

Social Security Disability Insurance and Supplemental Security Income are not the same program. Receiving SSDI can lead to Medicare eligibility after the applicable waiting period, while SSI by itself does not automatically establish the same Medicare entitlement.

People with ALS and ESRD have special rules. If you receive disability benefits, confirm which program pays your benefits and whether your Medicare coverage begins automatically.

For ESRD, the start date can depend on when dialysis begins, whether you participate in a qualifying home dialysis training program, or when a transplant occurs. These details can materially affect coverage.

See Medicare's ESRD eligibility guide and speak with your dialysis or transplant coordinator about timing.

Can a spouse's work record help you qualify?

Yes, in some circumstances. A spouse's or former spouse's Medicare-covered work record may help establish premium-free Part A eligibility, even if you personally did not work enough quarters.

The rules depend on the relationship, age, marital history, and other Social Security requirements. Widows and widowers may also have qualifying pathways.

Do not assume that one spouse's Medicare card covers the other spouse. Medicare is individual coverage.

Each person needs their own eligibility and enrollment determination, and each may have a different effective date or Part B premium.

What if you qualify for Medicare and Medicaid?

People who meet the requirements of both programs are often called dual eligible. Medicare generally pays first for Medicare-covered services, while Medicaid may help with certain remaining expenses and services under state rules.

Depending on eligibility, Medicaid can also assist with Medicare premiums and cost-sharing. Texas Medicaid eligibility is determined separately from Medicare eligibility.

Texas residents can explore programs through YourTexasBenefits. If you have limited income but do not qualify for full Medicaid, a Medicare Savings Program or Extra Help may still be available.

Applying for assistance does not change the federal Medicare eligibility requirements.

Does moving to Texas change eligibility?

Moving from another state generally does not end your entitlement to Original Medicare. However, private Medicare Advantage and Part D plans operate within service areas, so a permanent move may require you to change plans.

Medigap policies are generally portable with Original Medicare, although state rules and available premiums may differ if you seek a new policy.

If you are approaching 65 and planning a move, make sure Social Security and your health plans have the correct address. Your actual residence matters when checking private plan availability and Special Enrollment Period rights.

What to confirm before choosing a plan

Verify your Medicare eligibility category, whether Part A is premium-free, whether Part B is active, and the effective dates shown on your Medicare card.

Then review whether you have a Medigap open enrollment right or other guaranteed-issue protection.

Finally, check any employer, Medicaid, or retiree coverage that may coordinate with Medicare. These details determine which insurance options are realistically available to you.

Medicare eligibility decision path

Question 1: Are you approaching 65? If yes, check citizenship or qualifying residency requirements and whether you or a spouse have sufficient Medicare-covered work history for premium-free Part A.

Not having enough work credits does not necessarily make you ineligible for Medicare, but it can change your Part A premium.

Question 2: Are you younger than 65? If yes, check whether you qualify through applicable disability benefits, ALS, or end-stage renal disease.

These categories have different entitlement and timing rules; they should not be evaluated using only the standard age-65 checklist.

Question 3: Are you already receiving Social Security benefits? If yes, check whether Medicare enrollment will occur automatically. If not, determine whether you must apply.

Question 4: Do you have employer coverage? Eligibility and the decision to enroll immediately are different questions.

If you are still working, compare your expected retirement date with the employer plan's payer rules before choosing a Part B start date.

See our working-past-65 guide.

Frequently Asked Questions