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Health Insurance Glossary

Plain-language definitions of common ACA and health-insurance terms you may see while comparing plans, enrolling, receiving healthcare or reviewing claims.

✓ Plain-language terms✓ Shopping + claims vocabulary✓ Consumer reference
Consumer health insurance glossary education
Reference guide: Definitions are simplified for consumer education. Your specific policy, Summary of Benefits and Coverage, insurer documents and applicable law control actual plan terms.
Plan Costs

Common Cost Terms

Premium

The amount paid regularly, usually monthly, to maintain health insurance coverage.

Deductible

The amount you may pay for certain covered healthcare before the plan begins sharing applicable costs.

Copayment

A fixed amount you may pay for a covered healthcare service under applicable plan terms.

Coinsurance

A percentage of an allowed covered healthcare cost you may be responsible for.

Out-of-Pocket Maximum

The applicable annual limit on what you pay for covered in-network services, subject to plan rules.

Cost Sharing

A general term for the portion of covered healthcare costs paid by the member, such as deductibles, copays and coinsurance.

Doctors & Prescriptions

Access and Coverage Terms

Provider Network

The doctors, hospitals, facilities and other providers that contract with a health plan under its network arrangements.

In-Network

A provider or facility participating in the plan's applicable network.

Out-of-Network

A provider or facility outside the applicable plan network; coverage and consumer costs can differ significantly.

Formulary

The plan's list of covered prescription drugs, often organized into tiers and subject to plan rules.

Prior Authorization

A plan requirement to obtain approval for certain healthcare services or medications before they are provided or covered under applicable terms.

Referral

A direction or authorization from a healthcare provider, often a primary care provider, to receive certain specialist care when required by the plan.

Marketplace & Claims

ACA and Insurance Paperwork Terms

Premium Tax Credit

Financial assistance that may reduce qualifying Marketplace premiums for eligible consumers.

Cost-Sharing Reduction

Additional savings that may reduce certain out-of-pocket costs for qualifying consumers enrolled in eligible Silver Marketplace coverage.

Special Enrollment Period

An enrollment opportunity outside annual Open Enrollment when applicable qualifying circumstances and Marketplace requirements are met.

Explanation of Benefits (EOB)

A statement showing how an insurer processed a healthcare claim. It is generally not itself a bill.

Claim

A request for payment or coverage submitted to an insurer for healthcare services or items.

Allowed Amount

The amount recognized by the health plan for a covered healthcare service under applicable plan arrangements.

Put the Terms Into Practice

Understand What Your Plan Documents Are Telling You

Next, learn how these terms appear on an Explanation of Benefits and provider bill.

Understand EOBs & Medical Bills →