Medicare, Explained Without the Sales Pitch
What each part actually does, where the gaps are, and which questions only Medicare and Social Security can answer for you.
This page explains how the pieces of Medicare fit together. It does not tell you which plan to pick, what you will pay, or when your own enrollment window opens — those depend on your record and your county, and they are answered by Medicare, by the Social Security Administration, and by the plan documents themselves. What I can do is make sure you understand the choice in front of you before you make it.
What Medicare is
Medicare is the federal health insurance program for people 65 and older, and for some younger people with certain disabilities or with End-Stage Renal Disease. It is administered by the Centers for Medicare & Medicaid Services, and enrollment is handled through the Social Security Administration.
It is not one policy. It is a set of parts that you combine, and the combination you end up with is the actual decision — not whether to "get Medicare".
What this does not tell you: Whether you qualify, and on what basis, is determined by Medicare and the Social Security Administration from their own records.
Source: Medicare.gov, Centers for Medicare & Medicaid Services (CMS), Social Security Administration (SSA)
Part A — hospital insurance
Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people have paid into it through payroll taxes during their working years and do not pay a monthly premium for it.
Part A pays toward the cost of a covered stay; it is not a flat "hospital is free" benefit. What you owe depends on the length of the stay and where the care is delivered.
What this does not tell you: Whether you owe a Part A premium depends on your own or your spouse's work history, which only Social Security can confirm.
Source: Medicare.gov
Part B — medical insurance
Part B covers doctor visits, outpatient care, preventive services, lab work, and durable medical equipment. Nearly everyone pays a monthly premium for it, and higher-income households pay more.
Part B is where most of the ongoing decisions live, because it is the part that leaves a share of the cost with you on every service rather than only on a hospital admission.
What this does not tell you: The premium amount changes each year and varies with income. Get your figure from Medicare or Social Security, not from any broker's website.
Original Medicare
Part A and Part B together are called Original Medicare. It is accepted by any provider in the country who takes Medicare assignment, which is its main advantage — there is no network to check before you travel or relocate.
Original Medicare on its own has no annual cap on what you can spend out of pocket, and it does not include prescription drug coverage. Those two gaps are the reason the other parts exist.
What this does not tell you: Whether a specific provider accepts Medicare assignment is a question for that provider's office.
Source: Medicare.gov
Part D — prescription drug coverage
Part D covers prescription drugs. It is offered by private insurers under contract with Medicare, either as a standalone plan alongside Original Medicare or built into a Medicare Advantage plan.
Every Part D plan publishes a formulary — its own list of covered drugs and the tier each one sits on. Two plans with similar premiums can treat the same prescription very differently, which is why the comparison has to be done against your actual medication list.
What this does not tell you: Formularies and pharmacy networks are set per plan and per year. A drug covered this year on this plan is not guaranteed to be covered next year.
Source: Medicare.gov, Centers for Medicare & Medicaid Services (CMS)
Part C — Medicare Advantage
A Medicare Advantage plan is an alternative way to receive your Part A and Part B benefits, offered by a private insurer approved by Medicare. You stay enrolled in Medicare; the plan administers your coverage.
These plans use provider networks and typically bundle in drug coverage and extras. They also carry an annual out-of-pocket maximum, which Original Medicare does not. The trade is network and prior-authorization rules in exchange for that cap and the extras.
Which plans exist where you live is decided county by county and refreshed for each plan year.
What this does not tell you: I do not represent every Medicare Advantage plan available in your area, and no site can tell you which plan is best for you. Whether your own doctors are in a given plan's network has to be verified against that plan for the year in question.
Source: Medicare.gov, Centers for Medicare & Medicaid Services (CMS)
Medicare Supplement (Medigap)
A Medicare Supplement policy sits alongside Original Medicare and pays some of the costs Original Medicare leaves to you. Supplement plans are standardized by letter, so a given lettered plan covers the same things regardless of which company sells it — the differences are price, service, and availability.
A Supplement is not the same thing as a Medicare Advantage plan and you do not hold both. A Supplement also does not include drug coverage, so people who choose this route usually add a standalone Part D plan.
What this does not tell you: Whether you can buy a Supplement without medical underwriting depends on your own timing and circumstances, and the rules differ by state. This is one to ask about directly rather than assume.
Source: Medicare.gov
How enrollment timing works, in general terms
Medicare has an enrollment window tied to when you first become eligible, a general window for people who missed it, windows tied to specific life events such as leaving employer coverage, and an annual window in the autumn when existing enrollees can change plans for the following year.
Which of those applies to you depends on facts about your own situation — your eligibility date, whether you are still working, and what coverage you have now. Enrolling late without a qualifying reason can attach a permanent surcharge to your premium.
Because the consequences are lasting, confirm your own dates with Medicare or Social Security rather than relying on a general description, including this one.
What this does not tell you: No specific dates appear on this page on purpose. Your windows are individual, and Medicare and the Social Security Administration are the only sources that can state yours.
The decisions that come up, and when
The sections above explain what the parts of Medicare are. These are the situations people actually call about. Each says what the decision is about rather than what to decide — the specifics turn on your record, your doctors, and your county.
Turning 65
The decisions start before the birthday rather than after it. What is worth knowing is that there is a sequence, that parts of it are time-limited, and that the order matters.
This is the most common reason people call, and the one where starting early costs nothing and starting late can cost a good deal.
Still working at 65
Having employer coverage at 65 changes the decision, and the right answer depends on the size of the employer and what the plan covers. It is not the same answer for everyone, which is precisely why it is worth asking rather than assuming.
Medicare Advantage
One of the two main routes for receiving your coverage. It bundles benefits differently and works through provider networks, which makes the doctors you want to keep central to the decision.
Medicare Supplement
The other main route, designed to sit alongside original coverage and pay toward costs it leaves you. The trade-offs against Advantage are real and go in both directions depending on your situation.
Prescription drug coverage
A separate decision from the two above, and one that turns on the specific medications you take. Drug lists differ between plans and change between years.
Enrollment periods
Medicare has defined windows rather than year-round enrollment, and missing one has consequences. The specific dates and rules are worth confirming with a licensed broker or the official sources rather than from memory.
Common mistakes
The recurring ones are about timing, and about assuming a plan covers a doctor or a drug that it does not. Both are avoidable by checking before enrolling.
Common questions
Where should I start with Medicare?
With a conversation, ideally several months before you turn 65. The decisions interact — how you receive coverage, whether you add drug coverage, whether you add a supplement — and the right combination depends on your health, the doctors you want to keep, the medications you take, and whether you are still working. BishopPlans can walk through it with you.
Does BishopPlans help with Medicare?
Yes. Carter Bishop is an independent licensed broker, which means he works for you rather than for a carrier. A review carries no fee to you and no obligation.
What if I am still working at 65?
The decision is genuinely different, and it depends on the size of your employer and what the plan covers. It is one of the more common places people get incorrect advice from friends, because the answer that was right for someone else may not be right for you. Worth asking rather than assuming.
Where can I find official Medicare information?
The official source is medicare.gov, and 1-800-MEDICARE. Your State Health Insurance Assistance Program also offers free counselling. BishopPlans is a private independent brokerage and is not connected with or endorsed by any government agency.
Related coverage
- All coverage — health, Medicare, retirement and supplemental, and where each one starts.
- Retirement & annuities — for the income side of the same retirement decision.
- Health insurance — if you are under 65, or covering a spouse who is.
- Supplemental protection — what these policies do, and what they do not.
What to have in front of you
None of this is required to call. It just makes the conversation a useful one instead of a scheduling exercise.
- The doctors and hospitals you want to keep using
- Your current prescriptions, with dosages, and the pharmacy you use
- Whether you or your spouse are still working, and whether either of you has employer coverage
- Any letters or notices you have received from Medicare or Social Security
- Whether you travel or spend part of the year in another state
Please do not email your Medicare number, Social Security number, or medical history. Nothing on this page needs them, and I will never ask you to send them by email.
Where the official answers live
- Medicare.gov(opens in a new tab)
- Centers for Medicare & Medicaid Services (CMS)(opens in a new tab)
- Social Security Administration (SSA)(opens in a new tab)
Content on this page last reviewed 2026-07-26 by Carter Bishop.
About this Medicare information
This page is educational. It is not connected with or endorsed by the U.S. government or the federal Medicare program. Medicare eligibility, enrollment periods, and plan availability are determined by Medicare and the Social Security Administration — not by this site, and not by contacting Carter. Confirm anything you read here against Medicare.gov or 1-800-MEDICARE before you act on it.
Have a Medicare question? Ask it.
A call with me is a conversation about how the parts work and what to check before you decide. It does not determine your eligibility, set your enrollment dates, or change anything about your Medicare record — only Medicare and the Social Security Administration do that, and contacting me does not affect either. I do not represent every plan available in your area.
Preparing for a Medicare conversation? The free resources include a worksheet for getting your doctors, prescriptions, and questions in one place. Comparing coverage that is not Medicare? Start with the other coverage categories.