Medicare is one of the most valuable benefits available to Americans 65 and older — but it can also be one of the most confusing. The program has multiple parts, specific enrollment windows, and rules that change from year to year. Missing a deadline or misunderstanding what's covered can cost you significantly.
This guide breaks down the essentials of how Medicare works, what has changed recently, and what you should pay attention to in 2026.
A Quick Refresher: The Parts of Medicare
If you're new to Medicare or want a refresher, here's how the program is structured:
- Part A (Hospital Insurance): Covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. Most people don't pay a monthly premium for Part A if they or their spouse paid Medicare taxes while working.
- Part B (Medical Insurance): Covers outpatient care — doctor visits, preventive services, lab tests, durable medical equipment. Part B has a monthly premium, which is income-adjusted.
- Part C (Medicare Advantage): An alternative to Original Medicare offered by private insurers. Plans must cover at least what Parts A and B cover, and many include prescription drug coverage, dental, and vision. Costs and coverage vary significantly by plan and region.
- Part D (Prescription Drug Coverage): Standalone drug coverage available to those with Original Medicare. Also offered through many Medicare Advantage plans.
- Medigap (Supplemental Insurance): Private policies that help cover costs Original Medicare doesn't — copayments, coinsurance, and deductibles. Medigap doesn't work with Medicare Advantage.
Key Changes to Watch in 2026
Each year brings adjustments to Medicare costs, coverage thresholds, and policy. Here are the areas worth paying attention to in 2026:
Part D out-of-pocket cap. One of the most significant recent changes to Medicare is the new $2,000 annual cap on out-of-pocket prescription drug costs under Part D, which took effect in 2025 and carries forward in 2026. If you take expensive medications, this limit can represent substantial savings compared to prior years, when catastrophic drug costs could run into thousands of dollars.
Medicare Advantage enrollment trends. More than half of Medicare beneficiaries are now enrolled in Medicare Advantage plans. If you're in one, review your plan's Annual Notice of Change each fall — premiums, formularies (the list of covered drugs), and provider networks can change year to year. A plan that worked well last year may no longer be your best option.
Part B premium adjustments. The standard Part B premium tends to adjust annually. Check Medicare.gov for the current year's figure, and note that if your income is above certain thresholds, you'll pay a higher premium through what's called IRMAA (Income-Related Monthly Adjustment Amount). A jump in income two years prior — a home sale, for example — can trigger IRMAA, but you can appeal if your income has since decreased.
Preventive services. Medicare continues to expand covered preventive services. Many screenings — colorectal cancer, diabetes, cardiovascular disease, depression — are covered at no cost when billed correctly as preventive. Ask your doctor to confirm how a visit will be coded before it happens.
Enrollment: Don't Miss Your Windows
Medicare enrollment rules are strict, and missing a deadline can result in permanent premium surcharges or gaps in coverage.
- Initial Enrollment Period (IEP): A 7-month window around your 65th birthday — three months before, the month of, and three months after. Enroll in Part B during this window to avoid late penalties.
- Special Enrollment Period (SEP): If you're still covered by an employer health plan when you turn 65, you can delay Part B enrollment without penalty. You'll get a Special Enrollment Period when that coverage ends. Make sure the employer coverage qualifies — coverage through a spouse's employer generally counts; COBRA and retiree insurance do not.
- Annual Enrollment Period (AEP): Runs from October 15 to December 7 each year. This is when you can switch between Original Medicare and Medicare Advantage, change Part D plans, or make other coverage adjustments for the following year.
- Open Enrollment for Medicare Advantage: January 1 through March 31. If you're already in a Medicare Advantage plan and want to switch to a different Advantage plan or return to Original Medicare, this window allows it.
Common Medicare Mistakes to Avoid
A few missteps are surprisingly common — and surprisingly costly:
- Delaying Part B enrollment when you shouldn't. If you're not covered by qualifying employer insurance, delaying Part B past your Initial Enrollment Period triggers a permanent 10% premium increase for each year you delayed.
- Assuming Medicare covers everything. Original Medicare has no cap on out-of-pocket costs for Parts A and B. This is why many people add a Medigap policy or choose Medicare Advantage — to get that cost protection.
- Not reviewing your Part D plan annually. The drugs a plan covers and what you pay for them can shift each year. Even if your medications haven't changed, your costs might have.
- Forgetting about dental and vision. Original Medicare generally doesn't cover routine dental, vision, or hearing care. If these matter to you — and they should — factor this into your plan comparison.
Where to Get Reliable Help
Medicare decisions are consequential, and the right choice varies based on your health, medications, and finances. Fortunately, free, unbiased help is available:
- Medicare.gov — the official site has plan comparison tools and detailed coverage information
- SHIP (State Health Insurance Assistance Program) — free one-on-one counseling from trained volunteers; find your local program at shiphelp.org
- 1-800-MEDICARE — available 24/7 for coverage questions
Avoid relying solely on plan marketing materials, which are designed to sell you something. An independent counselor or your own research on Medicare.gov will give you a clearer picture.