Premiums, deductibles, copays & coinsurance
Four terms, one bill — here's how they actually work together.
You've seen these words on every plan document you own. This guide shows exactly how they interact on a single bill, not just what each one means in isolation.
See how a bill actually breaks down ↓What each one actually means
These aren't interchangeable — each does a different job in how your cost gets calculated.
Premium
What you pay — usually monthly — to keep your coverage active, whether or not you use any care.
Common mistake: thinking your premium counts toward your deductible or out-of-pocket max. It generally doesn't.
Deductible
What you may pay for covered services before your plan starts paying its share, according to your plan's rules.
Common mistake: assuming every service is subject to the deductible — some copays apply from day one.
Copay
A fixed amount you may pay for a specific covered service, regardless of the service's total cost.
Common mistake: assuming the same copay applies to every visit type — specialist and ER copays are often higher.
Coinsurance
A percentage of the cost you may pay, generally after your deductible has been met.
Common mistake: confusing this with a copay — coinsurance scales with the price of the service, a copay doesn't.
From the full charge to what you actually owe
Example only — using a $1,000 procedure, deductible not yet met this year. Your plan's actual numbers will differ.
Why this isn't the same as the sticker price
Your insurer's negotiated "allowed amount" is usually lower than the provider's initial charge — and it's the allowed amount, not the sticker price, that your deductible and coinsurance are calculated from.
What you'd pay depends on timing, too
Same $1,000 procedure, same plan — three different outcomes depending on where you are in your plan year.
You generally pay the full allowed amount yourself, up to your deductible.
Now coinsurance applies instead — generally a percentage, not the full amount.
Your plan generally pays 100% of covered costs for the rest of the plan year.
Where patients usually get tripped up
"I pay my premium, so I shouldn't owe anything else."
Your premium keeps coverage active — it's separate from what you owe when you actually use care.
"My copay and coinsurance are the same thing."
A copay is a fixed dollar amount; coinsurance is a percentage that scales with the cost of the service.
"Once I hit my deductible, care is free."
Coinsurance (or copays) usually still apply after the deductible — until you reach your out-of-pocket max.
"My out-of-pocket max includes my premium."
Premiums generally don't count toward your out-of-pocket maximum — only cost-sharing does.
Questions to ask about your specific costs
- Have I met my deductible this plan year?
- Is this specific service subject to the deductible?
- Does a copay or coinsurance apply here?
- What's the negotiated/allowed amount, not the sticker price?
- How close am I to my out-of-pocket maximum?
- Is the provider in-network for this plan?
In Canada? These four terms mostly apply to a different layer of coverage — see below.
Jump to the Canadian guide ↓These terms mostly describe your private/workplace layer, not your public plan
For medically necessary doctor and hospital care, provincial/territorial public health insurance generally doesn't use premiums, deductibles, copays, or coinsurance the way U.S. plans do. These four terms become relevant again once you're talking about a private or workplace benefits plan.
| Term | Public provincial/territorial plan | Private/workplace plan |
|---|---|---|
| Premium | Some provinces have used premiums differently over time — check your province's current rules | Often applies, frequently deducted from your paycheck if through an employer |
| Deductible | Generally not applicable to core covered services | Often applies, similar in concept to U.S. plans |
| Copay | Generally not applicable to core covered services | Sometimes applies, depending on the benefit |
| Coinsurance | Generally not applicable to core covered services | Often applies, especially for drugs, dental, and vision |
Premium
Deductible
Copay
Coinsurance
Don't assume — confirm
Provincial rules and private plan designs both vary. If you're unsure whether a term applies to your situation, your plan booklet or the number on your card is the fastest way to check.
What are you trying to do?
Check if a service is covered
Understand out-of-pocket maximums
Ask about a claim
Read the guide →Understand a bill
Read the guide →Understand my plan type
Read the guide →Resolve an insurance problem
Browse the Hub →Common questions about these four terms
Does a higher premium always mean a lower deductible?
Often, but not always — plans are generally structured as a trade-off between premium and cost-sharing, but exact numbers vary by plan. Compare your specific options rather than assuming.
Do copays count toward my deductible?
Depends on your plan — some copays count toward your out-of-pocket maximum but not your deductible. Check your specific plan documents.
What happens once I hit my out-of-pocket maximum?
Your plan generally pays 100% of covered services for the rest of the plan year — though your premium still continues separately.
Why did I pay more than my coinsurance percentage suggested?
Possible reasons include an unmet deductible, an out-of-network provider, a non-covered service, or a billing discrepancy — check your EOB for the specific breakdown.
Do these numbers reset every year?
Generally yes — deductibles and out-of-pocket maximums typically reset at the start of each new plan year, though the exact date depends on your plan.
Know the math. Know your next step.
Understanding how these four numbers interact is one of the most useful things you can know about your plan.