| Deductible reset | Annually, at the start of each plan year |
| Premiums count toward out-of-pocket maximum | No (Standard under ACA rules) |
| Preventive care and the deductible | ACA-compliant plans must cover many preventive services before the deductible applies (Affordable Care Act, Section 2713) |
| HSA eligibility requirement | Must be enrolled in a qualifying High Deductible Health Plan (HDHP) (IRS Publication 969) |
| SBC availability | Insurers are required to provide a Summary of Benefits and Coverage before enrollment (ACA requirement) |
Why the vocabulary on your health plan matters
Health insurance paperwork uses a small set of terms that appear on nearly every plan. Misreading even one of them, say, confusing a copay with coinsurance, can lead to real budget surprises. This reference defines each term plainly so you can read your Summary of Benefits and Coverage (SBC) with confidence before you need to use it.
For a broader look at how insurance functions as a financial product, see what insurance actually does and what it doesn't.
Premium
The monthly amount you pay to maintain health coverage, regardless of whether you use medical services. Employer plans often share this cost with the employee.
Deductible
The amount you pay out of pocket for covered services before your insurer starts sharing costs. Resets each plan year.
Copay
A fixed dollar amount you pay for a covered service, such as a doctor visit or prescription. The amount is set by the plan and does not change based on the total cost of the service.
Coinsurance
Your percentage share of a medical bill after the deductible is met. For example, 20 percent coinsurance on a $200 bill means you owe $40.
Out-of-pocket maximum
The most you will pay in covered costs during a plan year. After reaching this cap, the insurer covers 100 percent of covered services for the remainder of the year.
Formulary
The list of prescription drugs a health plan covers, typically organized by tiers that correspond to different cost-sharing levels.
Prior authorization
A requirement that your doctor obtain insurer approval before certain services or medications are covered. Missing this step can leave you responsible for the full cost.
Health Savings Account (HSA)
A tax-advantaged account available to people enrolled in a qualifying high-deductible health plan. Funds can be used for eligible medical expenses and roll over from year to year.
Cost-sharing terms: the money you pay directly
Most of the confusion around health plans centers on cost-sharing, the portion of medical bills you owe after your insurer pays its share.
Premium
Your monthly payment to keep coverage active. You owe the premium whether or not you use any medical services that month. Employer-sponsored plans often split this cost between you and your employer.
Deductible
The amount you pay for covered services before the insurer starts sharing costs. If your deductible is $1,500, you pay the first $1,500 of covered bills each plan year. Some plans exempt certain services, such as preventive care, from the deductible entirely.
Copay
A fixed dollar amount you pay for a specific service, such as $30 for a primary care visit. Copays are predictable and often apply even before you meet your deductible, depending on the plan design.
Coinsurance
A percentage split between you and the insurer after you have met your deductible. An 80/20 plan means the insurer covers 80 percent and you owe 20 percent of the allowed amount for that service.
Out-of-pocket maximum
The most you will pay in covered costs in a single plan year. Once you hit this cap, the insurer covers 100 percent of covered services for the rest of the year. Premiums, out-of-network charges, and services the plan does not cover do not count toward this limit.
| Deductible reset | Annually, at the start of each plan year |
| Premiums count toward out-of-pocket maximum | No (Standard under ACA rules) |
| Preventive care and the deductible | ACA-compliant plans must cover many preventive services before the deductible applies (Affordable Care Act, Section 2713) |
| HSA eligibility requirement | Must be enrolled in a qualifying High Deductible Health Plan (HDHP) (IRS Publication 969) |
| SBC availability | Insurers are required to provide a Summary of Benefits and Coverage before enrollment (ACA requirement) |
Network and coverage terms
Where you get care and who provides it directly affects what you pay.
In-network vs. out-of-network
Insurers negotiate rates with a defined group of doctors and hospitals. That group is the network. Seeing an in-network provider means your plan's standard cost-sharing applies. Going out of network usually means higher costs, and some plan types cover out-of-network care only in emergencies.
HMO, PPO, EPO, HDHP
These abbreviations describe how the plan manages your access to care. An HMO (Health Maintenance Organization) typically requires you to choose a primary care physician (PCP) who coordinates referrals to specialists. A PPO (Preferred Provider Organization) lets you see specialists without a referral and gives partial coverage out of network. An EPO (Exclusive Provider Organization) works like a PPO within network but offers no out-of-network coverage outside emergencies. An HDHP (High Deductible Health Plan) pairs a high deductible with lower premiums and eligibility to contribute to a Health Savings Account (HSA).
Formulary
Your plan's list of covered prescription drugs, usually organized into tiers that carry different cost-sharing levels. A drug not on the formulary may not be covered, or you may need prior authorization to get it covered.
Prior authorization
Approval your provider must obtain from the insurer before certain procedures, medications, or specialist visits are covered. Skipping this step when it is required can shift the full cost to you.
If you are also comparing other types of insurance coverage, the questions to ask before accepting any insurance policy can help you evaluate any plan systematically.
This article is for informational purposes only and is not personalized financial, insurance, or legal advice. Coverage terms, costs, and rules vary by plan and state. Read your actual policy documents and consult a licensed insurance professional for guidance specific to your situation.