Every health plan describes its costs with the same four words, and almost every confusing medical bill comes from misunderstanding how those four interact.
They are not four separate charges stacked on top of each other. They are stages in a sequence, and knowing which stage you are in tells you what a given visit will cost.
The four terms
Premium is what you pay every month to keep the plan active. You pay it whether or not you use any care, and it is the one payment that does not count toward anything else described below.
Deductible is the amount you pay for covered services before the plan starts paying its share. A plan with a $2,000 deductible pays nothing toward most services until you have paid $2,000 of covered charges yourself.
Copay is a flat amount for a specific service, such as a set dollar figure per office visit or per prescription. Many plans apply copays for some services before the deductible is met and apply the deductible to everything else.
Coinsurance is a percentage of the cost that you pay after the deductible is satisfied. If your plan pays 80 percent and you pay 20 percent, that 20 percent is your coinsurance.
Out-of-pocket maximum is the ceiling. Once your spending on covered, in-network care reaches it in a plan year, the plan pays 100 percent of covered in-network services for the rest of that year.
A note on vocabulary: coinsurance means something different in property insurance, where it is a condition requiring a building to be insured to a stated percentage of its replacement cost. Our coinsurance glossary entry covers both senses.
The order the money moves in
For a plan year, covered in-network care generally moves through these stages:
- You pay everything for services subject to the deductible, at the plan's negotiated rate rather than the provider's list price.
- The deductible is met. Now you and the plan split costs. You pay coinsurance, the plan pays the rest.
- The out-of-pocket maximum is met. The plan pays covered in-network services in full for the remainder of the year.
- The year resets. On the plan's renewal date, the deductible and out-of-pocket maximum start over at zero.
Copays and certain services can sit outside step one. Many plans cover preventive care with no cost sharing at all from day one, and many apply a copay to primary care or generic drugs before the deductible. Whether a specific service is subject to the deductible is a plan design choice, so read the Summary of Benefits and Coverage rather than assuming.
What counts toward the out-of-pocket maximum
This is where bills surprise people. The following table describes the common pattern for plans that comply with federal marketplace rules. Exact treatment varies by plan and by state, and the plan documents control.
| Payment | Counts toward the deductible | Counts toward the out-of-pocket max |
|---|---|---|
| Monthly premium | No | No |
| Deductible payments | Yes | Yes |
| Copays for covered services | Sometimes | Yes |
| Coinsurance | Yes | Yes |
| Out-of-network care | Often no, or to a separate amount | Often no, or to a separate amount |
| Non-covered services | No | No |
| Charges above what the plan allows | No | No |
Two entries in that table cause most of the trouble.
Non-covered services never count. If a plan excludes a treatment, paying for it yourself does not move you closer to the deductible or the maximum. Exclusions are listed in the plan documents, and our exclusion glossary entry explains the concept generally.
Out-of-network care is usually tracked separately, if at all. Many plan designs apply a second, higher deductible and out-of-pocket maximum to out-of-network care, and some plans do not cover it at all outside an emergency. We cover this in more detail in in-network, out-of-network and surprise bills.
Individual versus family amounts
A family plan usually carries two sets of numbers: an individual amount that applies to each covered person and a family amount that applies to the household as a whole.
Two structures are common, and plans differ:
- Embedded. Each person has their own individual deductible. Once one person meets it, the plan starts paying for that person even if the family amount has not been reached.
- Aggregate. The full family amount must be met before the plan pays for anyone. Aggregate deductibles appear more often on high deductible plans.
Federal rules require that no single individual in a family plan pay more than the individual out-of-pocket maximum, even where the family maximum is higher. Beyond that protection, the structure is a plan design choice, so ask which one applies before you enroll.
The federal ceiling on out-of-pocket costs
The Department of Health and Human Services sets a maximum annual limitation on cost sharing each year, and non-grandfathered individual and small group plans cannot exceed it for in-network essential health benefits. For the 2026 benefit year, that limit is $10,600 for self-only coverage and $21,200 for coverage other than self-only.
Two qualifications matter:
- It is a ceiling, not a typical figure. Many plans set their maximum well below the federal limit, and that is one of the more useful things to check when comparing plan designs.
- It applies to in-network essential health benefits. Out-of-network care and non-covered services fall outside it.
Enrollees with household income between 100 and 250 percent of the federal poverty level who choose a silver marketplace plan may qualify for cost-sharing reductions, which lower the deductible, coinsurance and out-of-pocket maximum below the standard plan design. That is covered in marketplace subsidies explained.
Reading a plan the way the numbers actually behave
When you evaluate a plan, the premium and the deductible are the two numbers printed largest, and neither one on its own tells you what a year will cost.
A more complete reading looks at:
- The out-of-pocket maximum, which is your worst case for in-network care.
- Which services skip the deductible, since a plan with copays for primary care and generics behaves very differently from one that applies the deductible to everything.
- Whether your regular doctors and hospitals are in network, because out-of-network care usually falls outside both the deductible and the maximum.
- Whether your prescriptions are on the formulary, and at which tier, since drug coverage often has its own cost-sharing structure.
- Whether the family deductible is embedded or aggregate, if you are covering more than one person.
A plan with a low monthly cost and a high deductible may fit someone who rarely sees a doctor and can absorb a large bill. The same plan may fit poorly for someone managing an ongoing condition. Neither answer is universal, and the right one depends on care you expect, care you cannot predict, and what you could pay in a bad year.
Where to get answers about your own plan
Cost-sharing rules are set in the plan documents, and they vary by insurer, by plan and by state. For questions about a specific plan, the sources that can actually answer are the plan's Summary of Benefits and Coverage, the insurer's member services line, a licensed agent, or your state Department of Insurance.
If you want to start the process of getting connected with licensed carriers and agents offering health plans in your area, you can request health insurance quotes. Our glossary covers the underlying insurance vocabulary in more depth.