Medicare is one of the most important programs the federal government runs, and also one of the most misunderstood. People approaching 65 often know they are supposed to enroll but are unsure what they are actually enrolling in, what it costs, and what it does not cover. That confusion leads to late enrollment penalties, gaps in coverage, and missed opportunities to lower out-of-pocket costs through programs most beneficiaries never hear about.
The program has been in operation since 1965 and is administered by the Centers for Medicare and Medicaid Services. It provides health insurance to people aged 65 and older, as well as to younger individuals who qualify based on disability or certain chronic conditions. Understanding how the program is structured, what each part covers, and what your real costs will be is the foundation for making good decisions about your healthcare going into retirement.
The Four Parts of Medicare
Medicare is divided into four distinct parts, each covering a different category of healthcare. Most people interact with at least two of them, and many interact with all four.
Part A is hospital insurance. It covers inpatient hospital stays, care in a skilled nursing facility following a qualifying hospital stay, home health services that are medically necessary, and hospice care for individuals with a terminal diagnosis. For most people, Part A has no monthly premium. If you or your spouse worked and paid Medicare taxes for at least ten years, you receive Part A at no cost. Those who do not meet that work history requirement pay a monthly premium that adjusts annually.
Part B is medical insurance. It covers outpatient services including doctor visits, specialist consultations, preventive screenings, diagnostic tests, mental health services, and durable medical equipment such as wheelchairs and oxygen supplies. Part B has a standard monthly premium, which in 2024 is $174.70 for most beneficiaries. Higher-income individuals pay more through an income-related adjustment. Part B also has an annual deductible, and after meeting that deductible, Medicare covers 80 percent of approved costs, leaving you responsible for the remaining 20 percent without a cap.
Part C, commonly called Medicare Advantage, is an alternative way to receive your Medicare benefits through a private insurance company approved by Medicare. These plans must cover everything that Original Medicare covers, but many include additional benefits that Original Medicare does not offer, such as dental, vision, hearing, and prescription drug coverage. Medicare Advantage plans operate with network restrictions, which means you typically need to use doctors and facilities within the plan’s network. Costs vary by plan and location.
Part D covers prescription drugs. It is offered through private insurance companies and can be added to Original Medicare as a standalone plan or may be included as part of a Medicare Advantage plan. Each Part D plan has its own list of covered drugs, called a formulary, and its own cost structure including premiums, deductibles, and copayments. If you have Medicare and delay enrolling in Part D without having creditable drug coverage from another source, you will pay a late enrollment penalty for as long as you have Part D coverage.
Who Qualifies and When to Enroll
Most people become eligible for Medicare when they turn 65. If you are already receiving Social Security benefits at that point, you are automatically enrolled in Parts A and B and will receive your Medicare card in the mail before your birthday month. If you are not yet receiving Social Security, you need to actively sign up.
Your Initial Enrollment Period is a seven-month window that begins three months before the month you turn 65, includes your birthday month, and extends three months after. Enrolling during the first three months of that window ensures your coverage starts the month you turn 65. Waiting until the last months of the window delays your start date.
Younger individuals qualify for Medicare if they have been receiving Social Security Disability Insurance for 24 months. People diagnosed with ALS receive Medicare immediately upon qualifying for SSDI. People with end-stage renal disease requiring dialysis or a kidney transplant also qualify regardless of age.
Missing your Initial Enrollment Period without qualifying for a Special Enrollment Period means waiting for the General Enrollment Period, which runs from January 1 through March 31 each year, with coverage starting July 1. Late enrollment in Part B also triggers a permanent premium penalty of 10 percent for each 12-month period you delayed.
A Special Enrollment Period applies if you delayed Medicare because you were still covered by an employer-sponsored health plan through active employment. Once that coverage ends, you have eight months to enroll in Part B without penalty. This is one of the most commonly misunderstood rules in Medicare, and getting it wrong is expensive.
Lowering Your Costs Through Supplemental Programs
One of the biggest surprises for new Medicare enrollees is that Original Medicare leaves significant out-of-pocket exposure. There is no cap on the 20 percent coinsurance under Part B, which means a serious illness can generate substantial costs even with Medicare coverage. Several programs exist specifically to address that gap.
Medigap, also called Medicare Supplement Insurance, is sold by private insurance companies and covers costs that Original Medicare does not, including copayments, coinsurance, and deductibles. There are ten standardized Medigap plans labeled A through N, each covering a defined set of costs. The best time to buy a Medigap plan is during your Medigap Open Enrollment Period, which is the six-month window starting the month you are both 65 or older and enrolled in Part B. During that window, insurance companies cannot deny you coverage or charge you more based on health conditions. Outside that window, medical underwriting applies in most states.
Medicare Savings Programs are state-run programs that help low-income Medicare beneficiaries pay their premiums, deductibles, and copayments. There are four levels of assistance depending on income. The Qualified Medicare Beneficiary program covers Part A and B premiums, deductibles, and cost-sharing. The Specified Low-Income Medicare Beneficiary program covers Part B premiums. The Qualifying Individual program also assists with Part B premiums. Each program has its own income and asset limits, and applications go through your state Medicaid office.
The Extra Help program, also called the Low Income Subsidy, reduces or eliminates Part D prescription drug costs for qualifying beneficiaries. People who receive full Medicaid benefits or who receive Supplemental Security Income are automatically eligible for Extra Help. Others can apply through the Social Security Administration at ssa.gov or by calling 800-772-1213. Extra Help can dramatically reduce what you pay for prescription drugs each month and is one of the most underutilized benefits in the Medicare system.
Choosing Between Original Medicare and Medicare Advantage
This is the central decision most new enrollees face. Original Medicare paired with a Medigap plan and a Part D plan gives you broad access to any provider that accepts Medicare and predictable out-of-pocket costs. Medicare Advantage consolidates everything into a single plan with potentially lower premiums but network restrictions and variable out-of-pocket maximums that can be higher in some plans than others.
The right choice depends on your health needs, where you live, how important provider choice is to you, and what your budget allows. People who travel frequently, live in rural areas with limited provider networks, or have long-standing relationships with specialists outside a plan network often find Original Medicare more practical. People who want a single plan covering medical, drug, dental, and vision coverage at a lower monthly premium often find Medicare Advantage more appealing.
Comparing plans using the Medicare Plan Finder at medicare.gov gives you side-by-side cost and coverage information for all plans available in your zip code. Reviewing that tool annually during the Open Enrollment Period, which runs from October 15 through December 7, lets you switch plans if your needs or the available options change.
Leave a Reply