Deductible, Coinsurance & Out-of-Pocket Max Explained

By Andrew Ullmann · Last updated August 25, 2026

The TL;DR:

Your deductible is what you pay before your plan starts sharing costs.
Coinsurance is the percentage of each bill you still pay after that.
The out-of-pocket maximum is the ceiling: once you reach it, your plan pays covered in-network care in full for the rest of the year.

Here's how the dollars actually flow.

The four levers of what you pay

Every plan splits costs between you and your insurer using the same four levers:

Premium - the fixed amount you pay every month just to keep the plan, whether or not you use any care.
Deductible - the minimum amount you pay before the plan starts paying its share (with exceptions for certain preventative services).
Copay - a flat fee per visit or prescription; coinsurance is a percentage of the plan's negotiated price.
Coinsurance - a percentage of the service's price based on the plan's negotiated rate.
Out-of-pocket maximum - the yearly cap on what you pay for covered in-network care. Hit it, and the plan pays that care in full for the rest of the year.

Every number but the premium sits on the first pages of your Summary of Benefits and Coverage (SBC). (The SBC deliberately leaves premiums out; those come with your enrollment or marketplace paperwork.) Never read your SBC? Learn how to break down that document here.

One final term unlocks the coverage math: the allowed amount - the price your insurer negotiated for a service. You could also see this as the "real price", insurer adjusted price, and negotiated rate. Your deductible and coinsurance are calculated from allowed amounts, not from a provider's list price. Allowed amounts live on your EOBs, explained line by line here.

How does the money actually flow? One example year

Look at the hypothetical example below. Meet Maya. Her plan:

$2,000 deductible
20% coinsurance after that
$6,000 out-of-pocket maximum

And all of her care is covered and in-network.

When	Care Cost (allowed amount)	Maya pays	Why	Her running total
January	Urgent care - $300	$300	Deductible not met yet	$300
March	MRI - $1,700	$1,700	Finishes the $2,000 deductible	$2,000
June	Outpatient procedure - $10,000	$2,000	Deductible done - she pays 20% coinsurance	$4,000
September	Hospital stay - $15,000	$2,000	20% would be $3,000, but the $6,000 max cuts it off	$6,000
November	Follow-up visits - $2,500	$0	Max reached - plan pays in full	$6,000

Walk it once and the three concepts snap into place:

Before the deductible (January, March): Maya pays everything herself - at the plan's negotiated prices - until she has paid $2,000.
After the deductible (June): the plan starts sharing. Coinsurance means she pays 20 cents of each dollar; the plan pays 80.
At the max (September): her cost sharing stops at $6,000 for the year. The plan absorbs the rest - including everything in November.

Maya's worst case was never the coinsurance or "20% of whatever happens." It was her out of pocket maximum ($6,000), plus her monthly premiums. That cap is the number the whole plan design hangs on.

So what's the difference between the deductible and the out-of-pocket max?

Both are running totals of your own healthcare spending, which get confusing. The difference is when each one switches on. The deductible is the minimum amount you need to pay before the plan's sharing begins - before it, you pay everything; after it, you pay a slice. The out-of-pocket max is where your contribution ends - after it, you pay nothing more for covered in-network care that year.

They also nest: your deductible payments for covered in-network care count toward the max, and so do the copays and coinsurance after it. In Maya's example year, the deductible was done in March at $2,000, and that same $2,000 was already a third of the way to her $6,000 max. One threshold starts the sharing. The other one caps your side of it.

Family plans: is your deductible embedded or aggregate?

Family coverage adds uncertainty that surprises people at the worst possible moment. Family deductibles come in two styles:

Embedded: each person has an individual deductible inside the family number. When one family member hits their individual deductible, the plan starts sharing that person's costs - even if the family total isn't met.
Aggregate: no individual deductibles. The full family deductible must be met - by any mix of family members - before the plan shares costs for anyone.

This means two plans with seemingly identical sticker deductible numbers can behave very differently when one person has a rough year. Your plan documents say which style you have; if the wording is murky, ask member services directly:

"Is our family deductible embedded or aggregate? Is our family out-of-pocket maximum embedded or aggregate? Please use the specific dollar amounts for when one family member alone has a high-cost year vs. the whole family."

Always ask them to put real numbers to your questions and get specifics on when your plan begins sharing costs post deductible.

What counts toward the out-of-pocket max - and what never does

This is where budgets get blindsided. The max only accumulates your cost sharing for covered, in-network care: deductible payments, copays, and coinsurance.

These don't count, no matter how much you spend:

Premiums. Never. You can hit your max in March and still owe a premium every month.
Balance bills. Amounts billed above your plan's allowed amount, usually by out-of-network providers.
Non-covered services. If the plan doesn't cover it, no dollar you spend on it moves any total.
Out-of-network care - usually. Many plans run a separate, higher out-of-network max; some have none at all, which means no ceiling out of network. Check the out-of-network column of your SBC.

Back to the example: if Maya's hospital stay had included a balance bill from an out-of-network specialist, that amount would sit on top of her $6,000 - and never count toward it.

So "I hit my max, everything is free now" is only true inside the fence - covered services, in-network providers. Outside the fence, the meter keeps running.

What number matters most?

When it comes to exposure (the $ risk for you or your family), the number that matters most is the out-of-pocket maximum plus your premiums for the year. That sum is your worst case for covered in-network care.

People often shop premiums for determining their plan, but that's like only looking at the sticker price for a car and not asking for the service record and accident history. It only shows part of the story (and not even necessarily the most expensive part).

A low premium usually travels with a high deductible and a high out-of-pocket max: this means these plans may be cheap in a healthy year, but really cost you in a bad one. A higher premium reduces the risk, but increases your guaranteed loss from premiums. Neither is automatically the right call - the mistake is comparing plans on premium alone.

When you're choosing, run the worst-case math side by side: how to compare health insurance plans. And if it comes down to a high-deductible plan versus a PPO, this breakdown runs that exact matchup.

The mid-year self-audit: check your accumulators

Your plan keeps running totals of your deductible and out-of-pocket spending - called accumulators. You can usually find these in your member portal on the dashboard.

NOTE: Your plan-maintained numbers can be wrong: a claim keyed to the wrong family member, in-network care processed as out-of-network, a payment that never registered can result in accumulator errors and cost you hundreds!

An accumulator that runs behind means you keep getting charged deductible you've already paid. That's why it is important to audit these numbers. It takes about ten minutes, twice a year:

Open the portal and write down the current deductible and out-of-pocket totals.
Pull your EOBs for the year and add up the "applied to deductible" and "your responsibility" lines for covered in-network care (how to read an EOB).
Compare. If your math says the deductible is met and the portal disagrees, call member services with the claim numbers, ask them to review and correct the accumulator. Remember to get a reference number for the call.

The fastest free way to do all of this

Every number in this guide you can find and track yourself - that's why we wrote it down. Candid tracks them for you, for free. Upload your plan documents and your bills and Candid keeps a live tally of your deductible and out-of-pocket-maximum progress as claims come in using the same accumulator math this guide teaches. It then flags any bill that charges you when a deductible or out-of-pocket maximum has already been met. The twice-a-year portal audit becomes a glance.

Candid is our tool - this guide is complete without it. It just turns an afternoon of fine print into a few minutes.

FAQ

Do copays count toward the deductible?

Usually not - many plans run copays and the deductible on separate tracks, so you can owe copays all year regardless of where the deductible stands. But plans differ: your SBC and plan contract say how yours works.

Do copays and coinsurance count toward the out-of-pocket maximum?

Generally yes, when they're for covered in-network care - deductible payments, copays, and coinsurance all accumulate toward the max. Premiums and balance bills never do.

What happens after I hit my out-of-pocket max?

For covered, in-network care, the plan pays in full for the rest of the plan year. You still pay for services that sit outside the max. Think premiums, anything for non-covered services, and (usually) all out-of-network costs.

Does my deductible reset every year?

Yes, at the start of each plan year - which is often, but not always, January 1. Your SBC lists the plan-year dates. Accumulators go back to zero, and the flow starts over from the deductible.

Can one plan have more than one deductible?

Yes. Plans can run separate deductibles for medical care and for prescriptions, and separate in-network and out-of-network deductibles - each with its own accumulator. Check each total in your portal, not just the headline number.

This guide is general information about health insurance and billing processes - not legal, medical, or financial advice.