What Is Medicare and Who Is Eligible?
Key Points
- Medicare is available to most people at age 65, as well as certain younger individuals with qualifying disabilities.
- Your Initial Enrollment Period begins three months before the month you turn 65.
- People with ESRD or ALS may qualify for Medicare before age 65.
Medicare is the federal health insurance program that serves tens of millions of Americans. Here's who qualifies, what it covers at a high level, and when your coverage can begin.
What Is Medicare?
Medicare is a federal health insurance program administered by the Centers for Medicare & Medicaid Services (CMS). It was established in 1965 to ensure that older Americans and people with certain disabilities have access to health coverage regardless of their income or health status. Unlike Medicaid, which is income-based, Medicare eligibility is primarily tied to age and work history.
The program is funded through a combination of payroll taxes, monthly premiums paid by enrollees, and general federal revenue. Most Americans who have worked and paid into the system for at least 10 years — or are married to someone who has — will qualify for Part A at no premium cost.
Who Is Eligible for Medicare?
The most common path to Medicare eligibility is turning 65. If you are a U.S. citizen or permanent legal resident who has lived in the country for at least five continuous years, you are generally eligible to enroll in Medicare at 65.
Younger individuals may also qualify for Medicare if they have received Social Security Disability Insurance (SSDI) benefits for 24 consecutive months. Two additional conditions — End-Stage Renal Disease (ESRD), which is permanent kidney failure requiring dialysis or a transplant, and Amyotrophic Lateral Sclerosis (ALS) — qualify individuals for Medicare immediately upon diagnosis, without the standard waiting period.
What Does Original Medicare Cover?
Original Medicare consists of two parts. Part A covers inpatient hospital stays, skilled nursing facility care following a qualifying hospital stay, hospice care, and some home health services. Most people do not pay a premium for Part A if they or their spouse have worked and paid Medicare taxes for at least 40 quarters.
Part B covers outpatient medical services — doctor visits, lab work, diagnostic imaging, preventive screenings, and durable medical equipment. Part B requires a monthly premium, which is adjusted annually and may be higher for beneficiaries with higher incomes through the IRMAA surcharge.
When Does Your Eligibility Begin?
Your Initial Enrollment Period (IEP) opens three months before the month you turn 65, includes your birthday month, and closes three months after. That gives you a seven-month window to enroll without any late penalties.
If you enroll during the first three months of your IEP, your coverage typically begins on the first day of your birthday month. If you enroll during or after your birthday month, your start date may be delayed by one or more months. Timing your enrollment correctly can prevent gaps in coverage — and working with a licensed Medicare broker can help you get it right.
Still Have Questions?
Our licensed Medicare brokers are here to help — at no cost to you.