Deductibles, Copays, and Out-of-Pocket Max

One of the most important — and confusing — aspects of US health insurance is cost-sharing: the amounts you pay out of your own pocket when you receive medical care, separate from your monthly premium. US health plans use four main cost-sharing mechanisms: the deductible, copays, coinsurance, and the out-of-pocket maximum. Understanding how these four elements work together is essential to knowing what you will owe for a given service.

The deductible: your annual threshold

The deductible is the amount you pay each plan year for covered services before your insurer begins sharing costs. Until you reach this threshold, you pay the full cost of most covered services (at the plan’s negotiated rate, not list price).

For example, if your deductible is a certain amount and you have a planned surgery, you will pay out of pocket for covered medical costs up to that amount. After that, cost-sharing kicks in — you typically pay a percentage (coinsurance) and the insurer pays the rest, up to your out-of-pocket maximum.

Not all services are subject to the deductible. Preventive care services, for instance, must be covered at no cost to the enrollee under the ACA, regardless of whether the deductible has been met. Many plans also exempt primary care visits or certain generic drugs from the deductible. Your plan’s Summary of Benefits and Coverage (SBC) document, which insurers are required to provide, lists which services are and are not subject to the deductible.

Some plans have separate deductibles for different types of services — for instance, a medical deductible and a separate prescription drug deductible. Some family plans have both individual and family deductibles; the family deductible aggregates across members until the threshold is met.

Copays: fixed amounts per service

A copay is a flat dollar amount you pay each time you receive a specific type of service, regardless of the total cost of the service. Common examples include a fixed amount for a primary care visit, a different amount for a specialist visit, a separate amount for an emergency room visit, and per-prescription amounts at different drug tiers.

Copays may or may not apply before you reach your deductible, depending on the plan design. Some plans require the deductible to be met first, then apply copays. Others apply copays from day one for certain services (like office visits) while the deductible applies to other services (like hospital care). Check your SBC to understand when copays apply for each service category.

Copays generally count toward your out-of-pocket maximum. Once your total out-of-pocket spending — including copays, deductible payments, and coinsurance — reaches the maximum, you pay nothing more for covered in-network services for the rest of the plan year.

Coinsurance: your percentage share

Coinsurance is your share of the cost of a covered service after you have met your deductible. It is expressed as a percentage. For example, a plan might cover a certain percentage of the allowed amount for a covered service, with the enrollee responsible for the remaining percentage.

The percentage is applied to the plan’s allowed amount — the rate negotiated between your insurer and the in-network provider — not the provider’s full list price. This distinction matters: the allowed amount for a procedure may be substantially lower than what the provider would charge an uninsured patient.

Coinsurance applies across a wide range of services — hospital care, specialist visits, lab tests, imaging, physical therapy, and others. Some services may use copays instead of coinsurance; many plans use coinsurance for higher-cost services.

The out-of-pocket maximum: your annual ceiling

The out-of-pocket maximum is the most you will pay for covered in-network services during a plan year. Once you reach this limit, the insurance plan pays 100% of covered costs for the remainder of the year. The out-of-pocket maximum is not optional — the ACA requires all non-grandfathered health plans to have one, and CMS sets an upper limit on how high it can be (adjusted annually).

What counts toward the out-of-pocket maximum varies by plan, but typically includes deductible payments, copays, and coinsurance for covered in-network services. Premiums, out-of-network costs, and costs for non-covered services do not count.

Plans may have separate out-of-pocket maximums for different types of costs (medical vs. drug) or for in-network vs. out-of-network care. Read your SBC carefully to understand how these limits interact.

How the pieces fit together: a worked example

To see how these elements work together, consider a person who has a planned outpatient procedure mid-year. At the start of the plan year, they have not met any of their deductible. They pay for covered medical costs at the plan’s negotiated rate until the deductible is met. After that, they pay only their coinsurance percentage for further covered services. Each copay for follow-up office visits also counts toward the out-of-pocket maximum. Once total out-of-pocket spending reaches the maximum, the plan pays 100% of covered in-network costs for the rest of the year.

Premiums paid each month do not reduce or count toward these thresholds — they are the cost of maintaining coverage, separate from the cost of using it.