Who Is Eligible for Medicare?

Medicare is federal health insurance for eligible people age 65 or older and certain younger people. Age, citizenship or residency requirements, disability benefits, and specific medical conditions can affect eligibility. Qualifying for Medicare, receiving premium-free coverage, and knowing when to enroll are related but separate questions.

Eligibility at Age 65

People age 65 or older may qualify if they meet Medicare’s citizenship or residency requirements. Many receive Part A without a monthly premium because they or a spouse paid Medicare taxes for enough time.

Lacking enough work for premium-free Part A does not necessarily mean you cannot get Medicare. Some people can buy Part A; Medicare requires Part B enrollment as well when purchasing Part A. Check your circumstances with Social Security rather than treating a ten-year work history as a universal Medicare eligibility requirement.

Sources: Medicare Eligibility and Getting Started; Medicare Costs and Premium-Free Part A.

Disability Benefits and ALS Before 65

People receiving Social Security disability benefits generally get Medicare automatically after receiving disability benefits for 24 months. The Medicare waiting period is different from SSDI’s waiting period for cash benefits. It is not measured simply from the day you file a disability application.

For ALS, Medicare begins automatically when Social Security disability benefits start. A diagnosis of another disabling condition alone does not automatically start Medicare. Check the coverage dates in your official enrollment materials, and contact Social Security if they do not match your understanding.

Sources: Medicare and Social Security Disability; SSA Disability Benefits^[1].

End-Stage Renal Disease Has Separate Rules

People with permanent kidney failure requiring regular dialysis or a kidney transplant may qualify at any age under the ESRD rules. They must also meet the applicable work or benefit-entitlement requirements, or qualify through a spouse or parent as specified by Medicare.

ESRD enrollment is not governed by the usual 24-month disability-benefit waiting period. Coverage timing depends on circumstances such as dialysis, home-dialysis training, or transplantation. Contact Social Security about enrollment and use Medicare’s ESRD guidance to understand your possible start date. Do not assume coverage always begins immediately with the diagnosis.

Sources: Medicare for End-Stage Renal Disease.

Check Enrollment, Coverage, and Costs

Some people are enrolled automatically; others must sign up. The usual initial enrollment period at 65 lasts seven months, beginning three months before the birthday month and ending three months afterward. Separate enrollment rules can apply to disability or other qualifying circumstances.

If you have insurance through work, ask how it coordinates with Medicare before delaying enrollment. COBRA does not extend the limited period for signing up for Part B after employment-based coverage ends. Part A, Part B, drug coverage, and Medicare Advantage have different roles and costs. Premium-free Part A does not make all Medicare care free; review the coverage choices and any premiums or cost sharing that apply.

Sources: Medicare Eligibility and Getting Started; Medicare Enrollment Timing; Medicare When Working Past 65; Medicare Parts and Coverage; Medicare Costs and Premium-Free Part A.

Related guides: SSDI and SSI Compared; Reasons to Consider Applying for Disability Benefits.

Source-checked October 16, 2026. This educational guide is not legal, tax, or medical advice. Disability Benefit Guide USA is not affiliated with the Social Security Administration or Medicare. Official agencies determine eligibility, payment amounts, and coverage under their programs.

Official Sources and References

These SSA.gov links support the explanations above. Official applications, account services, and agency forms are completed through SSA.

1. SSA Disability Benefits — SSA.gov