How a bill is split
When you get care covered by your plan, the bill is divided in a set order. First, the deductible: you pay 100% of the allowed amount until you have paid the plan’s deductible for the year. Second, coinsurance: after the deductible is met, you pay a percentage of the allowed amount (for instance 20%) and the plan pays the rest. Third, the out-of-pocket maximum: when your yearly total of deductible, coinsurance and copays reaches the plan’s maximum, the plan pays 100% of covered in-network care for the rest of the plan year. Premiums, out-of-network balance bills and non-covered services do not count toward the maximum.
A flat copay, such as $30 for a primary care visit, is a different way of paying: you owe that amount at the time of service and the deductible and coinsurance may not apply. Plans differ in whether they count copays toward the deductible. The calculator treats a copay as a fixed amount that counts toward the out-of-pocket maximum.
A worked example
Say your deductible is $3,000 and you have paid $1,000 of it so far. Your coinsurance is 20% and your maximum is $7,500, of which you have used $1,000. You have an outpatient procedure with an allowed amount of $4,000. You pay the remaining $2,000 of the deductible first. The leftover $2,000 attracts 20% coinsurance, or $400. So you pay $2,400, and your plan pays $1,600. After the procedure you have no deductible left, and you still have $4,100 of room until the maximum is reached.
Finding your numbers
- Deductible and out-of-pocket maximum: your plan’s Summary of Benefits and Coverage (SBC), insurer website or member card portal. Plans commonly list separate numbers for individual and family, and for in-network and out-of-network.
- Amount met so far: your insurer’s member portal shows deductible and out-of-pocket accumulators.
- Allowed amount: ask the provider for a “good faith estimate” before the service. If you are uninsured or not using insurance, providers must give you one in advance under the No Surprises Act.
Family plans: aggregate and embedded deductibles
On a family plan, an embedded deductible means each person has an individual deductible within the family one, so one person’s care starts being covered once that person hits the individual limit. An aggregate deductible means the family must meet the full family deductible before the plan pays (except for preventive care). Under federal law, no single person can pay more than the individual out-of-pocket limit even in a family plan ($10,600 for 2026 and $12,000 for 2027 per individual in ACA-compliant plans). Use the individual numbers for one person if the plan is embedded and the family numbers if it is aggregate.
Ways to lower what you pay
- Use in-network providers and facilities, and verify that the surgeon, anesthesiologist and facility are all in network.
- Ask whether a lower-cost site, such as an outpatient surgery center or an independent imaging center, is covered, since prices can differ greatly.
- If a service is scheduled late in the year, ask whether it is better to move it so that it falls in a year in which your deductible is already met, and whether scheduling it in January would start a new deductible.
- Pay with HSA or FSA money, which makes the bill cheaper after tax.