# How does health insurance work?

> Your premium keeps the plan. The deductible, copays and coinsurance are your share of care, capped by the out-of-pocket maximum.

Source: https://www.walletprep.com/learn/health-insurance-basics/ · Updated 2026-10-01 · Protect yourself

You pay a monthly premium to keep the plan, then share the cost of care through a deductible, copays and coinsurance. The out-of-pocket maximum caps what you pay for covered, in-network care in a plan year.

## Key facts
- **Five numbers decide what you pay.** The premium, deductible, copay, coinsurance and out-of-pocket maximum. Find all five on your plan's summary of benefits and coverage before you need care.
- **The deductible comes first.** For most services you pay the full agreed price until you have paid your deductible for the year. After that, you pay coinsurance or a copay and the plan pays the rest.
- **The out-of-pocket maximum is a cap.** Deductibles, copays and coinsurance for covered in-network care count toward it. Premiums and out-of-network charges usually do not. The federal limit changes each year; HealthCare.gov lists the current figure.
- **Network matters.** Prices are lower and your costs count toward the cap when you use in-network doctors, hospitals and pharmacies. Going out of network can mean a higher share, a separate deductible or no coverage.

## The five terms in plain words
The premium is what you pay each month to have the plan. The deductible is what you pay for covered care each year before the plan starts sharing costs. A copay is a flat fee, such as $30 for a doctor visit. Coinsurance is a percentage of the bill, such as 20%, that you pay after the deductible.
The out-of-pocket maximum is the most you pay in a plan year for covered, in-network care. Once you hit it, the plan pays 100% of covered services until the year resets.

## How a bill moves through your plan
First, the provider bills your plan, and the plan cuts the price to its agreed rate. Second, you pay that rate until your deductible is met. Third, you pay your coinsurance share of what is left. The plan stops asking you to pay once your total reaches the out-of-pocket maximum.
Copays often work outside this order. Many plans charge a flat copay for office visits or prescriptions even before the deductible. Your plan's summary of benefits shows which services work which way.

## In network and out of network
A network is the group of doctors, hospitals and pharmacies that have a contract with your plan. Using them keeps prices at the agreed rate and counts toward your out-of-pocket maximum.
Out-of-network providers can charge more, and some may bill you for the gap between their price and what your plan pays. This is called balance billing. Federal rules protect you from many surprise bills, like most emergency care and some care at in-network hospitals. Check your plan's directory before a planned visit.

## Choosing between a low and high deductible
A plan with a low deductible usually has a higher premium. A plan with a high deductible usually has a lower premium. Add a year of premiums to the out-of-pocket maximum to see your worst-case year for each plan.
If you rarely need care and have savings to cover the deductible, a lower premium can make sense. If you expect regular care, a planned surgery or a baby, a lower deductible may cost less over the year.

## A worked example: who pays a $5,000 bill
Leo has an example plan with a $1,500 deductible, 20% coinsurance and a $5,000 out-of-pocket maximum. He has paid nothing toward his deductible this year when a $5,000 in-network bill arrives.

- In-network bill: $5,000
- Leo pays the deductible: −$1,500
- Left after the deductible: = $3,500
- Coinsurance rate: 20%
- Deductible: $1,500
- Coinsurance (20% of $3,500): $700
- Leo pays: = $2,200
- Plan pays ($5,000 − $2,200): $2,800

1. Leo pays the first $1,500, his full deductible. That leaves $5,000 − $1,500 = $3,500 of the bill.
2. His coinsurance is 20% of the rest: $3,500 × 0.20 = $700. The plan pays the other 80%, which is $2,800.
3. His total is $1,500 + $700 = $2,200. That is under his $5,000 cap, so the cap doesn't kick in yet.
4. His premiums are separate. They don't count toward the $2,200 or the cap.

## Common mistakes
- **Comparing plans by premium alone.** The cheapest monthly premium can be the most expensive plan in a year with a hospital stay. Compare a full year of premiums plus the out-of-pocket maximum.
- **Assuming every doctor is covered.** A provider in the same hospital can be out of network. Check the plan's directory, and ask the office to confirm, before a planned visit or procedure.
- **Paying the first bill you get.** Wait for your plan's explanation of benefits, then match it with the bill. Billing errors happen, and you can ask questions or appeal before you pay.

## Questions people ask
### Does a copay count toward my deductible?
It depends on the plan. Copays usually count toward your out-of-pocket maximum, but many plans don't count them toward the deductible. Your summary of benefits and coverage says how yours works.

### Is a higher deductible plan worth it?
It can be if you are healthy, rarely use care and have cash saved to cover the deductible. Compare each plan's yearly premiums plus its out-of-pocket maximum to see the worst case.

### What is an explanation of benefits?
It is a statement from your plan, not a bill. It shows what the provider charged, the agreed price, what the plan paid and what you may owe. Use it to check the bill you get from the provider.

### What if I get a surprise out-of-network bill?
Federal rules protect you from many surprise bills, such as most emergency care. Call your plan first, then see CMS.gov's No Surprises page for how to dispute a bill.

## Do this today
Log in to your plan or find its summary of benefits and coverage. Write down your premium, deductible, coinsurance, copays and out-of-pocket maximum, and check how much of the deductible you have met this year.

## Sources
- [HealthCare.gov: Deductible](https://www.healthcare.gov/glossary/deductible/)
- [HealthCare.gov: Co-insurance](https://www.healthcare.gov/glossary/co-insurance/)
- [HealthCare.gov: Copayment](https://www.healthcare.gov/glossary/co-payment/)
- [HealthCare.gov: Out-of-pocket maximum/limit](https://www.healthcare.gov/glossary/out-of-pocket-maximum-limit/)
- [HealthCare.gov: Your total costs for health care](https://www.healthcare.gov/choose-a-plan/your-total-costs/)
- [CMS: No Surprises Act](https://www.cms.gov/nosurprises)

_General education, not personalized financial, tax or legal advice. Figures are examples. Check current rates and limits before you act._