Premium, Deductible, Copay, Coinsurance, Max Out-of-Pocket: The Five Words That Run Your Medicare Advantage Plan
Every September a thick envelope shows up from your Medicare Advantage plan. Inside is a table with two columns, this year and next year, and a dozen rows of numbers. Most people look at it the way you would look at a utility bill in a language you half speak. You recognize the dollar signs. You are not quite sure which ones are going to hurt.
There are only five words in that table that matter. If you know what each one means, you can read the whole thing in ten minutes and decide, with real confidence, whether to keep your plan. This page explains the five, one picture each, and then walks one person through a whole year so you can see them working together.
The five, in one sentence each:
- Premium is the monthly bill you pay whether or not you use the plan.
- Deductible is the first dollars of the year you pay yourself before the plan starts sharing.
- Copay is a flat price per visit or per day, fixed in advance.
- Coinsurance is a percentage of the bill, so it grows with the bill.
- Max out-of-pocket is the ceiling: the most you can pay in a year for covered medical care, after which the plan pays everything.
The one people get backwards: the deductible is the floor and the maximum is the ceiling. They are not the same number, and on most Advantage plans the floor is $0.
The sample plan we will use
Every number below comes from one made-up plan. It is in the range of real Central Kentucky HMO plans, but it is not any carrier's plan and nothing here is a quote. Your own numbers are in your Summary of Benefits.
- Monthly premium: $0
- Medical deductible: $0
- Primary care visit: $0
- Specialist visit: $45
- Emergency room: $125
- Hospital stay: $350 a day, days 1 to 5, then $0
- Outpatient surgery, MRI, infusions: 20% coinsurance
- Physical therapy: $40 a visit
- Max out-of-pocket, in network: $5,000
2. Deductible
The amount you pay yourself at the start of the year, for the services it applies to, before the plan starts sharing the cost. The sample plan's medical deductible is $0, so here is what a $250 one would look like:
Figure 2. A deductible is a starting hurdle, not a yearly cap. Once it is met, you are still paying copays and coinsurance until you reach the out-of-pocket maximum.
Three things about deductibles on Advantage plans that surprise people. First, many plans set the medical deductible at $0, so you go straight to copays. Second, when a plan does have one, it usually applies only to some services, such as a hospital stay or outpatient surgery, and not to a $0 primary care visit. Third, the prescription drug deductible is a separate thing, up to $615 in 2026 and $700 in 2027, and it sits inside the drug benefit, not the medical one.
What a deductible is not: it is not the most you can pay. Meeting it does not switch the plan to free. It is the entry fee, and copays and coinsurance begin once it is paid.
On the Annual Notice of Change: a medical deductible appearing where there was none (say, $0 to $300) means the first $300 of hospital or surgery bills next year is yours before the copays even start. Check which services it applies to; the Evidence of Coverage lists them.
3. Copay
A flat dollar amount for a visit or a service, printed in advance. $45 to see a specialist is $45 whether the specialist bills $150 or $600.
Figure 3. Copays are the easiest term because they are fixed. The catch is that they add up: a hospital copay is per day, and a specialist copay is per visit.
Copays are the most predictable of the five and the easiest to budget. The two places they bite are frequency (a $45 specialist copay is $540 a year if you go monthly) and the per-day hospital copay, which most people have never had to think about. $350 a day for days 1 to 5 means a four-day stay is $1,400 and a six-day stay is $1,750. That single row often moves more money than every other copay combined.
On the Annual Notice of Change: copays change in small-looking steps, $45 to $50, $350 to $395. Multiply each change by how often you actually use that service. Five dollars times your twelve cardiology visits is $60; forty-five dollars times a four-day hospital stay is $180.
4. Coinsurance
Your share of the bill as a percentage. At 20 percent coinsurance, a $1,500 MRI costs you $300. An $8,000 infusion at the same 20 percent costs you $1,600.
Figure 4. Coinsurance is a copay that scales with the bill. You cannot know the dollar amount until you know the price of the service, which is why it is the term people like least.
Coinsurance is where the unpredictability lives, because you cannot know your cost until you know the price, and prices for the same scan vary between hospitals. On Advantage plans it most often shows up on outpatient surgery, imaging, chemotherapy and infusions, durable medical equipment, and increasingly on dental. Our guide to dental coinsurance on Advantage plans walks through a crown under both designs.
The protection against coinsurance is the next term. Coinsurance can produce a scary number on one bill, but it cannot take you past the maximum.
On the Annual Notice of Change: watch for a service moving from a copay to a percentage (an MRI going from "$250" to "20%"), and for the percentage itself rising. A change from 20 to 30 percent is a 50 percent increase in what you pay on every one of those bills.
5. Max out-of-pocket
The most you can pay in a calendar year for covered medical care in the plan's network. Once your deductible, copays and coinsurance add up to this number, the plan pays 100 percent of covered care until January 1.
Figure 5. The maximum is the one number that tells you your worst case. Add twelve months of premiums to it and you have the most a bad year can cost you for covered medical care.
This is the number that makes a Medicare Advantage plan safe to carry, and it is the one Original Medicare by itself does not have. Federal rules cap what a plan may set it at: $9,250 in network for 2026 and $9,850 for 2027, with a higher combined limit on PPO plans that includes out-of-network care ($13,900 in 2026, $14,800 in 2027). Most plans set theirs well below the ceiling; the typical in-network limit on 2026 plans is in the $5,000 to $6,000 range, lower on HMOs and higher on PPOs.
Three things do not count toward it, and these are the ones that catch people: your premiums (plan and Part B), your prescription drug costs (those have their own cap, $2,100 in 2026 and $2,400 in 2027), and extras like dental, vision and hearing. So your true worst case for a year is the maximum, plus twelve months of premiums, plus the drug cap. For the sample plan that is $5,000 plus $2,434.80 in Part B premiums, about $7,435, before drugs.
On the Annual Notice of Change: this is the row to read first. A maximum going from $5,000 to $5,900 raises your worst-case year by $900 even if nothing else on the page moves. It is also the fairest single number for comparing two plans: a plan with slightly higher copays and a much lower maximum can be the safer choice.
The mix-up: deductible versus maximum
Here is the mistake I see more than any other, and it runs in both directions.
Someone opens the notice, sees "Maximum out-of-pocket: $5,900," and reads it as a deductible: I have to pay $5,900 before this plan covers anything. They are frightened by a number that is actually their protection. Or they see "Deductible: $0" and read it as a maximum: I have no costs on this plan. Then the first hospital stay arrives at $350 a day.
Figure 6. Same bar, two ends. The deductible sits at the bottom and is usually small or zero. The maximum sits at the top and is the largest number on the page. People read the big number as a hurdle. It is a lid.
The confusion is not a Medicare problem; it is a vocabulary problem that most of the country shares. In a national Policygenius survey, only 4 percent of insured adults could correctly define all four of deductible, copay, coinsurance and out-of-pocket maximum. Only 42 percent defined out-of-pocket maximum correctly, even though 67 percent said they understood it. A 2013 study in the Journal of Health Economics found 14 percent could answer all four concept questions. These were general-population surveys, not Medicare-specific, but nothing about turning 65 makes the words clearer.
The fix is a single sentence to keep: the deductible is what you pay first; the maximum is the most you can pay, ever, in a year. One is a floor you step over on the way in. The other is a ceiling that most people never touch.
One whole year, all five at once
Meet Ruth, 71, in Nicholasville, on the sample plan. She is reasonably healthy until a knee gives out in June.
Figure 7. Six months of ordinary care cost her under $400. One knee and its complications took her to the ceiling by September. From there, every covered medical bill was $0 until January.
| Month | What happened | Which term | She paid | Running total |
|---|---|---|---|---|
| Jan | Primary care checkup | Copay | $0 | $0 |
| Feb | Orthopedic specialist | Copay | $45 | $45 |
| May | MRI, $1,500 bill | Coinsurance, 20% | $300 | $345 |
| Jun | Knee replacement, 4 hospital days | Copay, $350 a day | $1,400 | $1,745 |
| Jul | Physical therapy, 20 visits | Copay, $40 a visit | $800 | $2,545 |
| Aug | ER visit, then 3-day readmission | Copays | $1,175 | $3,720 |
| Sep | Infusions, $8,000 bill (20% would be $1,600) | Coinsurance, capped | $1,280 | $5,000 |
| Oct to Dec | Follow-ups, more therapy, a scan | Maximum reached | $0 | $5,000 |
Sample plan arithmetic, not a quote. Deductible $0. Premiums and prescription drugs are separate and not shown.
Notice what the year teaches. Through May, the plan cost Ruth $345: the copays and one coinsurance bill. The knee turned a cheap year into an expensive one in about ten weeks, and the per-day hospital copay was the biggest single line. In September the maximum did its job: the plan owed her 20 percent of $8,000, but she only had $1,280 of room left under the ceiling, so that is all she paid. For the rest of the year, every covered bill was $0.
Her total for the year: $5,000 in cost sharing, plus $2,434.80 in Part B premiums, plus whatever her prescriptions cost under the separate drug cap. That is her worst case, and she knew it on January 1, because the maximum told her.
Now read your Annual Notice of Change
Your plan must get this notice to you by September 30 each year. It shows this year and next year side by side. With the five words in hand, it reads like this:
Figure 8. The notice puts this year and next year side by side. You now know what every row means, so you can ask the only question that matters: on the care I actually use, what does next year cost me?
Here is how to use it, in order:
When I sit down with someone's Annual Notice of Change, the first thing I do is put my finger on the maximum out-of-pocket row and ask, "Do you know what this number is?" More often than not the answer is a version of "that's what I have to pay before it kicks in." It is not. It is the opposite. And the relief on people's faces when they understand that is the reason I wanted this page to exist.
The second thing I do is ask what care they actually had this year. That turns the table from twelve abstract rows into two or three that matter. Anyone can do that at their own kitchen table once they know the words.
Common questions from Kentucky
What is the difference between a deductible and an out-of-pocket maximum on Medicare Advantage?
The deductible is the amount you pay first, at the start of the year, before the plan shares costs on the services it applies to. Many Medicare Advantage plans set the medical deductible at $0. The out-of-pocket maximum is the most you can pay in a calendar year for covered in-network medical care, counting deductible, copays and coinsurance together. Once you reach it, the plan pays 100 percent of covered care until January 1. The deductible is the floor; the maximum is the ceiling.
Does a $0 premium Medicare Advantage plan mean I pay nothing?
No. A $0 premium means the plan charges no monthly fee of its own. You still pay the Part B premium to Medicare, $202.90 a month in 2026, and you still pay the plan's copays and coinsurance when you use care, up to its out-of-pocket maximum. About 59 percent of 2026 plan offerings have a $0 premium.
What is the maximum out-of-pocket limit for Medicare Advantage in 2027?
For 2027, a Medicare Advantage plan may set its in-network out-of-pocket maximum no higher than $9,850, up from $9,250 in 2026. PPO plans have a higher combined limit that includes out-of-network care: $14,800 in 2027, up from $13,900. Most plans set their limits lower; the typical in-network maximum on 2026 plans is roughly $5,000 to $6,000. Prescription drugs have a separate cap of $2,400 in 2027.
What counts toward the out-of-pocket maximum?
Your deductible, copays and coinsurance for covered Part A and Part B medical services in the plan's network. Premiums do not count, prescription drug costs do not count (they have their own cap), and extra benefits such as dental, vision and hearing do not count. On an HMO, out-of-network care generally does not count because it is generally not covered.
What is the difference between a copay and coinsurance?
A copay is a flat dollar amount, such as $45 for a specialist visit, fixed no matter what the visit cost. Coinsurance is a percentage of the bill, such as 20 percent of a $1,500 MRI, which is $300. Copays are predictable; coinsurance grows with the price of the service. Both count toward your out-of-pocket maximum.
When do I get the Annual Notice of Change and what should I check?
Your plan must deliver the Annual Notice of Change by September 30. Check the out-of-pocket maximum row first, then the copay and coinsurance rows for the care you actually use, then whether any copay became a percentage. After the cost rows, confirm your doctors and hospital are still in network and your drugs are still covered on the same tier. The Annual Enrollment Period to change plans runs October 15 to December 7.
Want someone to read your notice with you?
Bring your Annual Notice of Change and a list of the care you had this year. I will go row by row, tell you what next year costs on the care you actually use, and say plainly whether the plan still fits. If it does, you will hear that. No charge.
Or call me directly: (859) 618-6443
Quick recap
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Written and reviewed by Austin Tyler, licensed Kentucky agent, NPN 20234188, Kentucky DOI license #1187780. Federal limits from the CMS CY2027 rate announcement; plan-landscape figures from KFF; Kentucky plan counts from the CMS landscape file, October 2026.
This article is general information, not advice for your specific situation. The sample plan and the year walk-through are illustrations of how premiums, deductibles, copays, coinsurance and out-of-pocket maximums work and are not quotes from any plan; your plan's actual costs are in its Summary of Benefits and Evidence of Coverage and can change each year. No specific plan is named or recommended. Tyler Insurance Group is not connected with or endorsed by the United States government or the federal Medicare program. We do not offer every plan available in your area. Currently we represent 6 organizations which offer 158 products in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Program (SHIP) to get information on all of your options.