Every plan has four numbers that matter, and the one printed largest in advertising is the one that tells you least about what a year will actually cost.
The four numbers
What you pay monthly. Predictable, visible, and the only one most comparison tools lead with.
What you pay before the plan starts paying. The amount you cover yourself first, each year, before most benefits begin.
What you pay per use after that. A share of each visit, procedure or prescription.
The most you could pay in a year. The ceiling. After you reach it, the plan covers the rest for the remainder of the year.
Any single one of those is misleading. Together they describe the plan.
The trade, stated plainly
Plans with a low monthly cost generally have a higher amount you pay before coverage starts, a higher share per use, and a higher ceiling. Plans with a high monthly cost reverse it.
This is not a trick. It is how the arithmetic has to work. The question is not which plan is cheaper — it is which shape of cost suits your year.
Two people, same plan, different answers
Someone who sees a doctor twice a year for routine things will usually do well on a low-monthly, high-exposure plan. They will not reach the amounts where it stings.
Someone managing a condition, taking regular medication, or with a procedure scheduled will usually do better with a higher monthly cost, because they are going to arrive at the other numbers regardless.
The mistake is not picking either one. The mistake is picking without knowing which person you are.
The worst case is the number to look at
If you want a single number to compare, use the last one — the most you could pay in a year — alongside the monthly figure.
Together they answer both questions that matter: what does this cost me when nothing happens, and what does it cost me when something does. That pair is far more informative than the monthly cost alone.
Where the fallacy does real damage
Three situations, all of which we see:
Marketplace shoppers who qualify for cost-sharing help. That help is generally only on Silver plans. Buying Bronze for the lower monthly figure can mean giving up assistance worth considerably more than the difference.
People with a prescription they take every month. The monthly premium is not where their money goes. The formulary tier is.
People who choose on price and lose their doctor. Switching back the following year is possible; getting the same specialist back mid-treatment sometimes is not.
What to do instead
- Write down what you actually used last year. Visits, prescriptions, procedures.
- Assume next year looks similar unless you know it will not.
- Compare plans on all four numbers against that usage.
- Check the network and formulary before comparing cost at all.
- Choose the shape that fits, not the number that is smallest.
We will lay out the four numbers side by side for the plans we can offer, against your actual usage rather than an average. We will also tell you when the plan you already have beats everything on our shelf — that happens, and saying so is the job.
The four numbers, and why one of them is not enough
A plan’s cost to you over a year is made of four moving parts, and the monthly premium is only the one you are shown first.
The premium is what you pay whether or not you see anyone. The deductible is what you pay before the plan starts sharing. Copays and coinsurance are what you pay each time you use care after that. The out-of-pocket maximum is the ceiling — the most you can be asked for in a year before the plan covers the rest.
Plans are built so these trade against each other. A low premium is usually bought with a high deductible, or a high maximum, or both. That is not a trick; it is the product working as designed. The trick is only in comparing on one number while the other three move.
Run it against a bad year, not an average one
The reason to hold insurance at all is the year that goes wrong. So the comparison worth doing is not what each plan costs if nothing happens — it is what each costs if something does.
Take each plan you are considering and work out two totals: premiums alone across a year with almost no care, and premiums plus the full out-of-pocket maximum. The first tells you the cost of being lucky. The second tells you your genuine worst case.
Plans that look far apart on the first frequently land close together on the second, and sometimes swap places entirely. A plan with a higher premium and a much lower ceiling can be the cheaper plan in exactly the year you needed insurance to work.
The parts that are not money
Two costs never appear in any of the four numbers and can outweigh all of them.
The network. A cheap plan that does not include your specialist is not cheap; it is a plan plus the cost of changing doctors, or the cost of going out of network. On some plans out-of-network care is not covered at all, which converts a premium saving into an unlimited liability.
The formulary. A cheap plan that puts your prescription on a high tier, or leaves it off, hands you the difference every month. Check drug by drug with doses before comparing premiums at all.
Where the trap is deliberate rather than accidental
One case deserves naming, because it costs specific people a great deal.
On the Marketplace, extra help with cost sharing is generally attached to Silver plans only, for households whose income qualifies. Someone who qualifies and chooses Bronze for the lower monthly figure can forfeit assistance worth considerably more than the premium they saved.
Nothing on the shopping screen shouts about this. The Bronze plan simply looks cheaper, because on the one number displayed most prominently, it is.
A comparison that actually works
- List your doctors and facilities, and your prescriptions with doses.
- Discard any plan that fails on network or formulary, whatever it costs.
- For each survivor, work out the premium-only annual total.
- For each survivor, work out premium plus out-of-pocket maximum.
- Check whether you qualify for cost-sharing help, and if so whether the plan you are drawn to can carry it.
- Then, and only then, compare.
Doing it in the other order is how people end up switching again a year later, sometimes having lost a doctor on the way.
For the complete market, including plans we cannot sell, HealthCare.gov and the Medicare Plan Finder are free and independent.
Where to check this independently
Nothing on this page is advice about your situation, and none of it replaces the free sources. The Medicare Plan Finder, 1-800-MEDICARE, your SHIP counselor and HealthCare.gov are free, independent, and show plans we cannot sell.
Healthbase is a licensed insurance agency, not a government agency and not connected with Medicare or any federal or state program.
