Deductible vs Copay vs Coinsurance: What's the Difference? (2027)

By Qamar S, 15 years in US medical billing · Last reviewed September 25, 2026

Your deductible is the amount you pay for covered care before your insurance starts sharing costs. A copay is a flat fee (like $30 for a visit), and coinsurance is a percentage of the bill (like 20%) that you pay after meeting your deductible. All three count toward your out-of-pocket maximum, the most you pay for covered in-network care in a year.

In one line each: Deductible = what you pay first. Copay = a fixed fee per service. Coinsurance = your percentage share after the deductible. Out-of-pocket maximum = your yearly ceiling. For 2027, that ceiling can be no higher than $12,000 for one person or $24,000 for a family on ACA-compliant plans.

The four terms side by side

Term	What it is	Example	Counts toward out-of-pocket max?
Deductible	What you pay for covered services before the plan pays its share	$2,000 per year	Yes
Copay	A fixed dollar amount for a specific service	$30 doctor visit, $10 generic drug	Yes
Coinsurance	Your percentage of the allowed amount after the deductible	20% of a $1,000 MRI = $200	Yes
Out-of-pocket maximum	The most you pay for covered in-network care in a plan year	$12,000 max for 2027 (self-only)	This is the limit
Premium	Your monthly payment to keep the plan	$450 per month	No

How they work together: a real-numbers example

Say your plan has a $2,000 deductible, 20% coinsurance, a $30 copay for office visits and a $6,000 out-of-pocket maximum. In one year you have:

Two office visits. You pay the $30 copay each time: $60. On many plans, copay visits are covered before the deductible, so they don’t wait on it.
A $5,000 outpatient surgery (allowed amount). You pay the first $2,000 to meet your deductible. Then you pay 20% of the remaining $3,000, which is $600. Your share: $2,600.
A $30,000 hospital stay later that year. You have already paid $2,660. You pay 20% until you reach $6,000 total, so you pay $3,340 more, and the plan pays everything else.

Your total for the year is $6,000, even though the care cost more than $35,000. After you hit the maximum, the plan pays 100% of covered in-network care for the rest of the plan year.

From 15 years in billing: most “wrong” bills I’ve seen weren’t really wrong. The patient’s deductible reset on January 1 and nobody told them. If a January bill is much bigger than December’s for the same care, check your EOB for “applied to deductible” before you call anyone.

Common questions people mix up

Does my copay count toward my deductible?

Usually not. Copays typically count toward your out-of-pocket maximum but not your deductible. Your plan’s Summary of Benefits and Coverage (SBC) spells this out. Look for the “What is the overall deductible?” and “Are there services covered before you meet your deductible?” rows.

What does “allowed amount” mean for coinsurance?

Coinsurance is a percentage of the allowed amount, the price your insurer agreed to with in-network providers. It is not a percentage of the provider’s full list price. Your Explanation of Benefits shows both numbers.

Do out-of-network bills count?

Often they don’t count toward your in-network out-of-pocket maximum, and some plans (like most HMOs) don’t cover them at all. The exception: in emergencies and at in-network hospitals, the No Surprises Act limits you to in-network cost-sharing. See PPO vs HMO for how networks differ.

Low deductible or high deductible: which is cheaper?

If you…	Consider
Rarely see a doctor and want low premiums	A higher-deductible plan, possibly with an HSA
Have ongoing prescriptions or planned surgery	A lower-deductible plan with predictable copays
Expect a big bill either way	Compare out-of-pocket maximums plus 12 months of premiums

A simple test: add up 12 months of premiums plus the out-of-pocket maximum for each plan. That’s your worst-case yearly cost. Then add premiums plus your expected costs for a typical year. Pick the plan that wins on the scenario you think is most likely. Open Enrollment for 2027 runs from November 1. See our Open Enrollment 2027 guide.

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Frequently asked questions

Is a copay the same as coinsurance?

No. A copay is a fixed amount ($30). Coinsurance is a percentage (20%), so what you pay depends on the size of the bill.

What happens after I meet my deductible?

You start paying copays or coinsurance, and the plan pays the rest, until you hit your out-of-pocket maximum. After that, the plan pays 100% of covered in-network care for the year.

Do premiums count toward my out-of-pocket maximum?

No. Premiums are what you pay to have the plan. They never count toward the deductible or out-of-pocket maximum.

Does preventive care count against my deductible?

Most ACA-compliant plans cover recommended preventive services, like yearly checkups and many screenings, at no cost in network, even before you meet your deductible.

Sources

This guide is educational and is not legal, financial or insurance advice. See our Disclaimer.