Copay vs. Coinsurance vs. Deductible
Copays, coinsurance, and deductibles are three ways a health plan splits costs with you, and they often appear on the same claim. This page explains what each one means and how they fit together.
At a glance
| Copay Copay | Coinsurance Coinsurance | Deductible Deductible | |
|---|---|---|---|
| What it is | A flat dollar amount for a service | A percentage of a covered cost you pay | The amount you pay before the plan shares most costs |
| How it is calculated | A set fee, for example $30 per visit | A share of the bill, for example 20% | A running total until you reach the threshold |
| When it applies | Usually at the time of service | Usually after you meet the deductible | Early in the year until it is met |
| Predictability | High; you know the amount in advance | Lower; it depends on the total bill | Fixed threshold, though the timing varies |
| Counts toward out-of-pocket max | Yes | Yes | Yes |
Three ways you share costs
A copay is a flat dollar amount you pay for a specific service, like $30 for an office visit, while a deductible is the amount you pay out of pocket before the plan begins sharing most costs.
Coinsurance is a percentage of a covered cost, such as 20% of a bill, and it usually applies after you have met your deductible. All three typically count toward your annual out-of-pocket maximum.
How they work together
On a single claim you might first pay toward the deductible, then a share as coinsurance, while routine visits may instead be handled with a simple copay.
The Summary of Benefits and Coverage
The Summary of Benefits and Coverage is a standardized document that lists your deductible, copays, coinsurance, and out-of-pocket maximum in one place.
The plan documents or Evidence of Coverage
The full plan documents explain which services use a copay, which apply coinsurance, and what counts toward the deductible.
Your explanation of benefits
After a visit, the explanation of benefits shows how the plan applied your copay, coinsurance, or deductible to that specific claim.
What it looks like on a real claim
Example 1 — A specialist visit in January
You see a specialist early in the year and the visit is billed at $300 before your deductible is met.
If the plan uses a $40 specialist copay, you pay $40.
Usually does not apply yet, since it starts after the deductible.
With no copay, the full $300 goes toward your deductible.
Example 2 — Outpatient surgery later in the year
You have outpatient surgery billed at $10,000 after meeting your $2,000 deductible.
Some plans charge a flat facility copay, for example $250.
At 20% coinsurance you pay $2,000 of the bill.
Already met, so it adds nothing more here.
The bottom line
Copays, coinsurance, and deductibles all describe your share of a medical bill, but they behave differently: copays are fixed, coinsurance scales with the cost, and the deductible is a threshold you cross once a year.
Because plans define these terms in their own documents, checking your Summary of Benefits and Coverage is the clearest way to see how each applies to your care.