Medicare 101: a first map of the whole system

Medicare is run by the federal government, but it is not one tidy package. It is a foundation of benefits the government administers, and then a series of optional layers that private companies sell on top. Understanding that split is the whole trick.

Two neighbors on the same street, both 66, can therefore live with completely different versions of Medicare. One hands over a card anywhere in the country and rarely sees a bill. The other needs a referral, stays inside a local network, and pays a copay each visit. Neither is doing anything wrong. They simply assembled the layers differently.

Part A is the hospital half: inpatient admissions, skilled nursing that follows a qualifying stay, hospice, and limited home health. If you or a spouse spent ten years paying Medicare taxes, you usually owe nothing for it each month.

Part B is the medical half: appointments, outpatient procedures, imaging, lab panels, wheelchairs and walkers, and a long list of preventive screenings. It carries a monthly charge, and for 2026 the standard rate is $202.90.

Part D covers prescriptions, sold either as a stand-alone policy or folded into a private plan. Part C is the odd one out in the naming scheme: it is the federal term for Medicare Advantage, a private plan that takes over delivery of your A and B benefits and often adds drug coverage, dental, hearing or fitness extras.

The first assembly is government Medicare (A and B) paired with a Medigap policy to absorb the cost sharing, and a stand-alone drug plan for prescriptions. You keep the broadest access to providers, and you accept a larger monthly outlay in exchange for very few surprise invoices.

The second assembly is Medicare Advantage. You keep paying the Part B rate, and a private insurer delivers your benefits through a network, usually with little or nothing added to that rate. The month-to-month cost is lower, and the cost of actually being sick is less predictable.

One rule settles more arguments than any other: a Medigap policy and a Medicare Advantage plan cannot operate together. Pick a side, and the rest of the decisions get simpler.

Start with the Part B rate of $202.90; Part A is normally free. Then add either a Medigap policy plus a drug plan, or an Advantage plan that may add nothing at all. Whichever you choose, the underlying government benefits still carry a $1,736 hospital deductible for each benefit period and a $283 annual Part B deductible, and covered drug spending stops at $2,100 for the year.

That is the floor and the ceiling in one paragraph. Everything else you read about Medicare pricing is a variation on those numbers.

The window runs seven months, built around the month you turn 65. If Social Security or Railroad Retirement is already paying you, the government enrolls you without paperwork and mails a card a few months ahead of the date.

If you have not claimed benefits yet, the filing is yours: ssa.gov, a phone call, or an appointment at a local office. Still on a payroll? An employer with 20 or more employees usually lets you postpone Part B with no penalty. A smaller employer flips the order, making Medicare primary, and you should file on schedule. Retirement, a move, or the loss of group coverage each opens a separate window later.

Close to your 65th birthday? Go to the turning 65 timeline. Not sure you qualify? Eligibility is the place to start. Already enrolled and unhappy? The enrollment calendar explains when a change is permitted. Every guide links onward, and a licensed agent will walk your own details at no charge whenever you want a human on the line.