Health insurance paperwork uses short words that can create expensive confusion. Learn the terms before you book a visit, fill a prescription, or choose a plan.
Key points
- The premium keeps the plan active. It is separate from the money you pay when you get care.
- The deductible is the amount you may pay for covered care before the plan pays for many services.
- A copay is a fixed price. Coinsurance is a percentage of the allowed cost.
- The network controls which doctors, clinics, hospitals, pharmacies, and suppliers usually cost less.
- The out-of-pocket maximum can limit covered in-network costs in a plan year, but it usually does not include premiums, uncovered care, or out-of-network costs.
- A claim, prior authorization, and explanation of benefits are billing and approval terms. Read them before you pay a confusing bill.
Who This Guide Is For
Use this if you have a school plan, employer plan, Marketplace plan, Medicaid or CHIP card, family coverage, or private health insurance and do not understand the words on your plan.
This guide helps you read your plan. It does not tell you which plan to buy or which medical care to choose.
The Terms To Learn First
Premium
The premium is the amount you pay to keep health insurance active. You may pay it monthly, through payroll, through your school bill, or directly to an insurance company.
Premiums are not the same as visit costs. You can pay a premium all year and still owe a copay, deductible, or coinsurance when you use care.
Deductible
The deductible is the amount you may pay for covered care before your plan starts paying for many services. A plan with a $2,000 deductible may make you pay the first $2,000 of covered services yourself before many plan payments begin.
Some care may work differently. HealthCare.gov says some plans pay for certain services before you meet the deductible, and Marketplace plans cover certain preventive benefits before the deductible.
Copay
A copay is a fixed amount for a covered service. For example, your plan might list a set price for a primary care visit, urgent care visit, specialist visit, or prescription.
Copays can be easier to plan for than coinsurance, but read the plan details. A visit can include extra lab work, imaging, facility fees, or prescriptions that cost more.
Coinsurance
Coinsurance is a percentage of the allowed cost for a covered service. If your coinsurance is 20%, you pay 20% of the allowed amount after the deductible rules apply, and the plan pays the rest.
The allowed amount matters. It is the plan's approved or negotiated amount, not always the first price a provider bills.
Out-Of-Pocket Maximum
The out-of-pocket maximum is the most you should pay in a plan year for covered in-network benefits. After you reach it, your plan pays 100% of covered in-network benefits for the rest of that plan year.
Do not treat this number as a total yearly spending cap. HealthCare.gov says the limit does not include monthly premiums, services your plan does not cover, out-of-network care, or costs above the allowed amount.
Network
The network is the group of doctors, clinics, hospitals, pharmacies, labs, and suppliers that contract with your plan.
In-network care usually costs less. Out-of-network care can cost much more, and some plans cover little or no out-of-network care except emergencies.
Claim
A claim is a request for payment that you or a health care provider sends to your insurer after you get care or items you believe the plan covers.
Many providers submit claims for you. If you pay out of pocket or use an out-of-network provider, you may need to ask your insurer how claims work.
Prior Authorization
Prior authorization means the plan may require approval before it covers a service or prescription. Common examples can include certain medications, imaging, procedures, specialist care, or equipment.
Do not assume a doctor's order means the insurer has approved payment. Ask the doctor's office and the insurer whether prior authorization is required and whether it has been approved.
Explanation Of Benefits
An explanation of benefits, often called an EOB, is a statement from the insurer after a claim. It usually shows the billed amount, allowed amount, what the plan paid, what was denied, and what the insurer thinks you may owe.
An EOB is not the same as a bill. Wait for the provider bill, then compare it with the EOB before paying a charge that looks wrong.
If a bill looks high or unclear, ask the doctor's office, clinic, hospital, lab, or billing department for an itemized bill. An itemized bill can show separate charges for the visit, facility, lab work, imaging, medication, supplies, and other services. Use it to compare the provider's charges with your EOB and to question duplicate charges, services you did not receive, wrong insurance processing, or a missing in-network adjustment.
How Costs Can Work
These examples show common patterns. Your plan can work differently.
Before You Use Your Plan
Plan terms checklist
0 of 7 doneCommon Mistakes
Decision Rules
| Situation | Practical rule |
|---|---|
| You are choosing between plans | Compare total risk: premium, deductible, copays, coinsurance, out-of-pocket maximum, network, and prescriptions. |
| You need non-emergency care | Check the network first. Call the office and confirm your exact plan. |
| You need emergency care | Call 911 or go to the nearest emergency room. Do not delay serious care to compare prices. |
| A doctor recommends a procedure, scan, or expensive medication | Ask whether prior authorization is required before the appointment or pharmacy pickup. |
| You receive an EOB | Save it and compare it with the provider bill before paying an amount you do not understand. |
| A bill looks wrong | Ask the provider for an itemized bill. Call the provider billing office and insurer. Ask for claim number, allowed amount, denial reason, and next appeal or correction step. |
What To Do Next
- Open your insurance card or online account.
- Write down your deductible, copays, coinsurance, out-of-pocket maximum, and member services number.
- Save one in-network primary care option, urgent care clinic, pharmacy, and hospital near you.
- Check whether your regular medication needs prior authorization or a preferred pharmacy.
- If you already have a bill that looks wrong, ask the provider for an itemized bill and compare it with your EOB before paying.
- Read Urgent Care Versus Emergency Room so you know where to go before you feel sick.
Related Guides
- Health Insurance Basics
- How to Find a Doctor or Clinic
- Urgent Care Versus Emergency Room
- First Week Checklist
- How to Protect Your Personal Information
Sources
This guide uses official or primary sources for rules and government steps. Local rules may still vary. (Last checked: September 10, 2026)
- HealthCare.gov: Premium
- HealthCare.gov: Deductible
- HealthCare.gov: Coinsurance
- HealthCare.gov: Out-of-pocket maximum/limit
- HealthCare.gov: Network
- HealthCare.gov: Claim
- HealthCare.gov: Prior authorization