Deductibles, Copays, and Coinsurance: The Three Cost-Sharing Terms That Confuse Everyone
Photo credit: TheBlogZappier.com | Simple Search, Credible Results
In this article
A clear breakdown of the three main out-of-pocket cost terms found in insurance policies and how each one affects what you pay at claim time.
Why These Three Terms Matter
When you receive a medical bill, an auto repair estimate after a claim, or an explanation of benefits from your insurer, three terms appear more than almost any others: deductible, copay, and coinsurance. Together, they define your cost-sharing obligation — the portion of covered expenses you pay directly, separate from your monthly premium.
Confusion about these terms is common and costly. Misunderstanding them can lead to budget surprises, avoidance of necessary care, or poor plan selection. This reference explains each one precisely, with concrete examples, so you can read any policy document with confidence.
For a broader look at how coverage categories work, see The Main Insurance Coverage Categories, Explained.
| What a deductible is | Amount you pay before insurer coverage begins |
| What a copay is | Fixed flat fee per service visit or prescription fill |
| What coinsurance is | Your percentage share of costs after the deductible |
| Common coinsurance split | 80/20 (insurer pays 80%, you pay 20%) |
| When cost-sharing stops | When you reach your plan's out-of-pocket maximum |
| Deductible reset frequency | Typically annual (check your plan year dates) |
Deductibles: The Threshold You Cross First
A deductible is the dollar amount you must pay out of pocket for covered services before your insurer begins contributing to costs. Until you meet it, most covered expenses are your responsibility in full.
Example: If your health plan has a $1,500 deductible and you need a $600 diagnostic test, you pay the full $600. After you reach $1,500 in covered expenses for the year, the insurer starts paying its share.
A few important nuances:
- Per-person vs. family deductibles: Family plans often have both an individual deductible and an aggregate family deductible. Check which threshold applies to each member.
- Service-specific deductibles: Some plans apply separate deductibles for prescriptions, mental health services, or out-of-network care.
- Deductible reset: Most deductibles reset annually — typically on January 1 or on your plan's anniversary date.
Higher-deductible plans generally carry lower monthly premiums. For a direct comparison of how deductibles relate to your annual out-of-pocket cap, see Deductible vs. Out-of-Pocket Maximum.
Deductible
The fixed dollar amount you must pay out of pocket for covered services each plan year before your insurer begins sharing costs. Services received before reaching this threshold are generally billed at the full allowed amount.
Copay
A predetermined flat fee charged for a specific covered service — such as a doctor visit or prescription — regardless of the service's total cost. Copays provide predictable, low-friction cost sharing.
Coinsurance
The percentage of covered costs you pay after satisfying your deductible. For example, 20% coinsurance means you pay one-fifth of the insurer's allowed charge; the insurer pays the remaining 80%.
Out-of-Pocket Maximum
The annual cap on what you pay in deductibles, copays, and coinsurance combined. Once reached, the insurer typically pays 100% of covered in-network costs for the rest of the plan year.
Premium
The fixed monthly amount you pay to maintain your insurance coverage, regardless of whether you use any services. Premiums do not count toward your deductible or out-of-pocket maximum.
Allowed Amount
The maximum amount an insurer will pay for a covered service based on its contractual rate with providers. Cost-sharing calculations — coinsurance, copays — are based on this allowed amount, not the provider's original billed charge.
Copays and Coinsurance: After the Deductible
Once your deductible is met, your insurer shares costs with you through one or both of these mechanisms:
Copays
A copay (short for copayment) is a fixed flat fee you pay for a specific service, regardless of the total cost of that service. Copays are predictable by design.
Example: Your plan charges a $30 copay for primary care visits. Whether that appointment is billed at $180 or $320, you pay $30 and your insurer covers the rest (subject to plan rules).
Copays are common for routine visits, specialist appointments, urgent care, and prescription tiers. Some plans apply copays even before the deductible is met for certain services — always check your Summary of Benefits and Coverage (SBC) document.
Coinsurance
Coinsurance is a percentage of the allowed cost that you pay after your deductible is satisfied. Unlike a copay, the dollar amount you owe varies with the size of the bill.
Example: Your plan has 20% coinsurance after a $2,000 deductible. You have a surgery billed at $8,000. After meeting your deductible, you owe 20% of the remaining $6,000 — that's $1,200 — and your insurer pays the other 80% ($4,800).
Plans often express this as an 80/20 or 70/30 split. The first number is the insurer's share; the second is yours. Coinsurance continues until you hit your plan's out-of-pocket maximum, at which point the insurer typically covers 100% of remaining covered costs for that plan year.
To understand how these terms appear in claims paperwork, see Insurance Claims Terminology You Need to Know. For plan structures that affect when these apply, see Health Insurance Plan Structures: HMO, PPO, EPO, and HDHP Compared.
Copays and Deductibles Can Overlap
Not all copays apply only after the deductible is met. Many plans charge copays for primary care visits and prescription drugs even before you reach your deductible. The interaction between copays and deductibles is plan-specific — always review your Summary of Benefits and Coverage (SBC) document, which insurers are required to provide and which summarizes exactly when each cost-sharing rule applies.
This article provides general insurance education and is not personalized financial, legal, or insurance advice. Coverage terms, amounts, and rules vary by policy, insurer, and state. Always read your actual policy documents and consult a licensed insurance agent or adviser for guidance specific to your situation.
Author
Insurance Basics Editorial Team
Insurance Basics Editorial Team is the collective byline for our editorial team and contributor network. Articles published under this byline or an editorial pen name are researched, written, and reviewed according to our editorial standards for clarity, consistency, and independence before publication.
View all articles →