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Health insurance terminology confuses almost everyone. Premium, deductible, copay, coinsurance, out-of-pocket maximum — these terms are often used interchangeably but they mean different things and affect your costs differently. Here is a plain English explanation of each one.
Premium
The monthly amount you pay for insurance coverage, regardless of whether you use any healthcare. You pay this whether you have zero doctor visits or fifty. It is the cost of having coverage.
Example: Your health insurance premium is $350/month. You pay $350 every month. If you have no medical expenses this month, you still pay $350.
In employer health insurance, your employer often pays most of the premium and you pay a portion through payroll deductions. If your employer covers 80% of a $1,200/month family plan, you pay $240/month.
Deductible
The amount you pay for covered services before your insurance starts paying. Each plan year (usually January 1 — December 31), you pay your full deductible before your insurance covers anything beyond preventive care.
Example: $2,000 individual deductible. Your first $2,000 of medical expenses each year: you pay 100%. After you hit $2,000, the insurance starts sharing costs with you.
Copay
A fixed dollar amount you pay for a specific service at the time of service. Copays are separate from your deductible on many plans — you pay the copay every time regardless of whether you have met your deductible.
Example: $30 copay for primary care visits, $60 copay for specialist visits. You pay these amounts each visit. Some plans only apply copays after the deductible is met; others apply them before.
Coinsurance
After you meet your deductible, coinsurance is the percentage split between you and your insurer for covered services. An 80/20 coinsurance means the insurer pays 80%, you pay 20% of covered costs after the deductible.
Example: You need a $10,000 surgery. Your deductible: already met. Coinsurance: 80/20. You pay 20% of $10,000 = $2,000. Insurance pays $8,000.
Out-of-Pocket Maximum
The most you will pay for covered services in a plan year. Once you reach this amount (counting deductible, copays, and coinsurance), your insurance pays 100% of covered services for the rest of the year.
The 2026 ACA out-of-pocket maximum limits: $9,450 for individual coverage, $18,900 for family coverage. No ACA-compliant health plan can have a higher out-of-pocket maximum than this.
How They Work Together: An Example
You have a health plan with: $1,500 deductible, $30 primary care copay (applies before deductible), 20% coinsurance after deductible, $6,000 out-of-pocket maximum.
Scenario: You have a bad year with several medical events:
- January: Primary care visit ($30 copay, you pay $30)
- March: Lab work ($400 bill, deductible not yet met, you pay $400)
- June: Emergency room visit ($8,000 bill, you pay remaining deductible $1,100 + 20% of remaining = $1,100 + $1,380 = $2,480)
- September: Surgery ($15,000 bill, by now you’re near your out-of-pocket max; you pay only enough to hit $6,000 total)
At the out-of-pocket maximum ($6,000), all further covered services are paid 100% by insurance for the rest of the year.
High Deductible vs Low Deductible Plans
High deductible health plans (HDHPs) have lower premiums but higher deductibles. You pay less monthly but more when you use healthcare. They qualify for HSA contributions — a significant tax advantage. Best for healthy people who rarely use healthcare and want to build an HSA.
Low deductible plans (PPOs, HMOs with low deductibles) have higher premiums but predictable costs when you use healthcare. Best for people who use healthcare regularly or have predictable annual medical expenses.
Sources: CMS ACA out-of-pocket maximum limits 2026; Healthcare.gov health insurance glossary; IRS HDHP definition for HSA eligibility. This article is for informational purposes only.
