See exactly how your deductible, coinsurance, and out-of-pocket maximum apply to a real medical bill.
Enter your plan details and a treatment cost to see how the payment may split. No personal information required.
The amount you pay first before coinsurance applies.
Your percentage of the remaining covered cost after the deductible.
How
This tool walks a treatment cost through your plan's actual cost sharing structure step by step: first your deductible, then coinsurance on the remaining amount, up to your annual out-of-pocket maximum.
Your premium, deductible, coinsurance, and out-of-pocket maximum work together in a specific order. The deductible applies first, meaning you pay the full cost up to that amount. After the deductible is met, coinsurance applies to the remaining cost, splitting it between you and your insurer at the percentage your plan specifies. This continues until you reach your out-of-pocket maximum, after which your insurer covers 100 percent of covered costs for the rest of the plan year.
The calculator does not require personal information and does not access your actual insurance plan.
Factors
Once your deductible is met, this percentage determines your ongoing share of costs. A 20 percent coinsurance plan means you pay 20 cents of every dollar in covered costs after the deductible, with your insurer covering the rest.
Family plans often have separate individual and family deductible and out-of-pocket maximum structures, meaning one family member's costs may satisfy an individual threshold while the family threshold still requires more combined spending.
This is the first cost sharing threshold. A higher deductible means you pay more out of pocket before coinsurance begins applying, but typically comes with a lower monthly premium.
This caps your total exposure for the year. Once your combined deductible & coinsurance payments reach this amount, your insurer covers 100% of further covered costs for the remainder of the plan year.
The total covered cost of the specific service or treatment determines how far it pushes you through the deductible, coinsurance, and out-of-pocket maximum structure in a single calculation.
Why
Unlike premium estimates, which vary by insurer risk assessment, deductible and coinsurance math follows a fixed formula once your plan's specific numbers are known. This tool calculates your exact out-of-pocket cost for the scenario you enter, based on standard cost sharing mechanics.
When
Using this tool before a planned procedure specifically can prevent an unpleasant surprise on your final bill, since the deductible and coinsurance math applies regardless of whether you calculated it in advance.
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Health Insurance Special
The table below illustrates total out-of-pocket cost for a $10,000 treatment across different deductible and coinsurance combinations.
| Deductible | Coinsurance | Out-of-Pocket Cost on $10,000 Treatment |
|---|---|---|
| $500 | 10% | $500 + $950 = $1,450 |
| $1,500 | 20% | $1,500 + $1,700 = $3,200 |
| $3,500 | 30% | $3,500 + $1,950 = $5,450 |
| $5,700 | 40% | $5,700 + $1,720 = $7,420 |
Note: These figures assume the out-of-pocket maximum is not reached within the treatment amount shown. Actual costs depend on your specific plan terms and whether services are in-network.
No. Your premium is a separate ongoing cost of maintaining coverage and never counts toward your deductible, coinsurance payments, or out-of-pocket maximum. Only costs you pay for actual covered medical care count toward those totals.
Your insurer covers 100 percent of covered costs for the remainder of that plan year. This resets to zero at the start of each new plan year, meaning the accumulation process begins again from the beginning.
Not exactly. Copays are typically a fixed dollar amount for a specific service, like a doctor visit, rather than a percentage of the total cost. This calculator focuses on deductible and coinsurance math specifically, since that’s what applies to larger treatment costs like the scenario you’re likely calculating.
A higher deductible means you’re accepting more of the initial cost risk yourself, which lowers the insurer’s expected payout and therefore the premium they charge. This calculator helps you see the actual dollar tradeoff, not just the premium difference, when comparing plans.
Not necessarily. If you rarely use significant medical care, a higher deductible plan with a lower premium often costs less overall across a full year. If you expect substantial medical costs, a lower deductible plan can reduce your total exposure despite the higher premium.
No, this tool assumes in-network costs and standard cost sharing rules. Out-of-network care often involves different, typically higher, cost sharing structures that this calculator doesn’t model.
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