Health Insurance Terms Explained
Deductible, coinsurance, copay, facility fee, out-of-pocket max. These words decide how much of a medical bill lands on you, and most explanations only add more jargon. Here is each one in plain English, with a real dollar example. Search a term below.
How a bill gets split between you and your plan
- 1
Deductible first. You pay 100% of covered care until you hit your deductible (say $2,000). Preventive care is usually free even before this.
- 2
Then coinsurance or copays. After the deductible, you and the plan share cost, for example you pay 20% coinsurance and the plan pays 80%, or a flat copay per visit.
- 3
Until your out-of-pocket max. Once your deductible, copays, and coinsurance add up to your out-of-pocket maximum (say $7,500), the plan pays 100% of covered in-network care for the rest of the year.
Catch: this only works cleanly for in-network, covered care. Out-of-network bills, non-covered services, and facility fees can fall outside it, which is where surprise bills come from.
Look up an insurance term
Search a term from your plan, bill, or Explanation of Benefits (for example coinsurance, facility fee, or out-of-pocket max) to see it in plain English with a real dollar example.
Most-searched terms
Deductible
What you payThe amount you pay for covered care each year before your insurance starts paying its share. Preventive care is usually free even before you meet it.
Example
With a $2,000 deductible, you pay the first $2,000 of covered bills yourself. After that, the plan begins paying its share.
Why it matters for your bill: A high deductible is why "having insurance" can still leave you with a big bill early in the year.
Coinsurance
What you payYour percentage share of a covered service after you have met your deductible. The plan pays the rest.
Example
With 20% coinsurance on a $1,000 allowed amount, you pay $200 and the plan pays $800.
Why it matters for your bill: Unlike a flat copay, coinsurance scales with the price, so it can be large on expensive care.
Copay (copayment)
What you payA fixed dollar amount you pay for a specific service, like $30 for an office visit or $250 for an ER trip.
Example
A $30 primary-care copay means you pay $30 at the visit regardless of the total charge.
Why it matters for your bill: Copays are predictable, but some services use coinsurance instead, which is not.
Out-of-pocket maximum
What you payThe most you will pay in a year for covered, in-network care. Once you hit it, the plan pays 100% of covered services for the rest of the year.
Example
With a $7,500 out-of-pocket max, once your deductible, copays, and coinsurance add up to $7,500, covered in-network care is free the rest of the year.
Why it matters for your bill: It caps your risk, but only for in-network, covered care. Premiums and out-of-network bills do not count toward it.
Facility fee
On your billA separate charge for the building and equipment where you were seen, added by hospitals and hospital-owned clinics on top of the doctor’s fee.
Example
A clinic visit might bill a $150 physician fee plus a $400 hospital facility fee for the same appointment.
Why it matters for your bill: It is why the identical service costs far more at a hospital-owned site than at an independent office or imaging center. It is often negotiable and sometimes billed in error.
See this on a bill? Get it reviewedAllowed amount
On your billThe maximum your plan will count toward a covered service, based on its contract with in-network providers. Your cost-sharing is calculated on this number, not the sticker price.
Example
If a provider charges $500 but the allowed amount is $200, an in-network provider writes off the $300 difference.
Why it matters for your bill: For in-network care, the huge "billed" number is not what anyone actually pays.
Balance billing
On your billWhen an out-of-network provider bills you for the difference between their charge and what your plan paid.
Example
An out-of-network surgeon charges $3,000, your plan allows $1,200, and you are billed the $1,800 balance.
Why it matters for your bill: The No Surprises Act now bans this in most emergencies and for many out-of-network providers at in-network facilities. Many balance bills are disputable.
See this on a bill? Get it reviewedExplanation of Benefits (EOB)
On your billA statement from your insurer showing what was billed, what the plan paid, and what you may owe. It is NOT a bill.
Example
An EOB might show a $500 charge, a $200 allowed amount, $160 plan paid, and $40 as your responsibility.
Why it matters for your bill: Compare the EOB to the provider’s bill. If the provider bills more than the EOB says you owe, that is a red flag.
In-network
Where you get careA provider or facility that has a contract with your plan to accept its negotiated rates.
Example
An in-network doctor accepts the plan’s allowed amount and cannot balance-bill you.
Why it matters for your bill: Staying in-network is the single biggest way to control cost and avoid surprise bills.
Out-of-network
Where you get careA provider with no contract with your plan. Your plan may pay less or nothing, and you can be balance-billed.
Example
An out-of-network anesthesiologist at an in-network hospital sends a separate, larger bill.
Why it matters for your bill: Confirm every provider (surgeon, anesthesiologist, assistant, lab) is in-network. Surprise out-of-network bills are a top dispute target.
See this on a bill? Get it reviewedInpatient vs outpatient
Where you get careInpatient means you are formally admitted and stay overnight; outpatient means you go home the same day, even after surgery or an ER visit.
Example
The same knee surgery costs far more inpatient (with a hospital stay) than outpatient at a surgery center.
Why it matters for your bill: Status drives price and coverage. "Observation" status is technically outpatient and can cost you more, especially on Medicare.
Prior authorization
Claims & processApproval your plan requires before it will cover certain services, drugs, or imaging.
Example
An MRI or a specialty drug may be denied if prior authorization was not obtained first.
Why it matters for your bill: Missing prior auth is usually the provider’s responsibility, and a denial can often be reversed retroactively.
See this on a bill? Get it reviewedDefinitions are general and simplified. Your plan documents and Explanation of Benefits use the exact terms that apply to you. This is general information, not insurance advice.
Why the words matter as much as the numbers
Most confusing medical bills are not math errors, they are terminology traps. A charge labeled a facility fee can often be avoided or negotiated. A balance bill from an out-of-network provider may be illegal under the No Surprises Act. A service marked non-covered might just be miscoded. Knowing what each term means is the difference between paying a bill and questioning it.
Once you know the terms, the next step is a real number. Use the free cost estimator to see what a service should cost for your ZIP and plan, and the CPT code lookup to decode the procedure codes on your bill.
Still not sure what your bill is saying?
Send us the bill and the Explanation of Benefits. CareRoute Bill Defense translates every line, flags charges you should not owe (facility fees, balance bills, non-covered errors), and negotiates down what is genuinely yours.
Have us review your billFree to submit. You only pay if we save you money.
Frequently asked questions
What is the difference between a copay, coinsurance, and a deductible?
A deductible is the amount you pay yourself before insurance starts paying (for example, the first $2,000 of covered care). A copay is a fixed dollar amount for a specific service, like $30 for an office visit. Coinsurance is a percentage of the cost you pay after meeting your deductible, like 20% of the bill. In a typical year you pay the deductible first, then coinsurance, until you reach your out-of-pocket maximum, after which covered in-network care is free.
Why do I owe money if I have insurance?
Insurance shares cost, it does not eliminate it. Before your plan pays much, you usually owe your deductible; after that, you owe coinsurance or copays up to your out-of-pocket maximum. You can also be billed for out-of-network care, non-covered services, and facility fees. Reading the codes and amounts on your Explanation of Benefits tells you which charges are truly yours and which can be disputed.
What is a facility fee and can I avoid it?
A facility fee is a separate charge for the building and equipment where you were seen, added by hospitals and hospital-owned clinics on top of the doctor’s fee. You can often avoid it by choosing an independent doctor’s office, imaging center, lab, or ambulatory surgery center instead of a hospital-owned location. When a facility fee does appear, it is frequently negotiable and sometimes billed in error.
What is the difference between inpatient and outpatient, and why does it matter?
Inpatient means you are formally admitted to the hospital and typically stay overnight; outpatient means you go home the same day, even after surgery or an ER visit. Status drives both price and coverage. The same procedure usually costs more inpatient. On Medicare especially, "observation" status is technically outpatient and can leave you owing more, so it is worth asking your status directly.
What should I do if a bill does not match my Explanation of Benefits?
Your EOB is not a bill; it shows what the plan says you owe. If the provider’s bill is higher than the "patient responsibility" on the EOB, ask the provider for an itemized bill and question the difference. Common causes are billing before insurance finished processing, balance billing, or errors. If it is not resolved, CareRoute Bill Defense can review the EOB and bill together and negotiate.
Related
Sources & references
These definitions are general and simplified for education. Your specific plan documents, Summary of Benefits and Coverage, and Explanation of Benefits use the exact terms and amounts that apply to you. This is general information, not insurance, legal, or financial advice. Last updated: September 2026.