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Medical Insurance Terms: Premium, Deductible, and Out-of-Pocket Costs

Understand common medical insurance cost terms so you can read a plan summary with better context.

Reviewed October 2026 · For general education; ask a licensed professional about your situation.

Medical Insurance Terms: Premium, Deductible, and Out-of-Pocket Costs — editorial photo from Unsplash
Health insurance guide Photo by Unsplash · Unsplash

Premiums are amounts paid to maintain coverage. A deductible, copayment, coinsurance, and out-of-pocket maximum describe different parts of how a plan may share covered costs. The exact definitions and exceptions come from the plan documents.

What to understand first

When comparing options, look at how costs apply to in-network and out-of-network services, prescriptions, family coverage, and specific categories of care. Review examples in the plan materials rather than comparing one number in isolation.

Questions and trade-offs to consider

A low premium does not necessarily mean lower total costs. Coverage rules, provider networks, excluded services, and annual limits can change the overall picture.

A practical next step

Use the plan’s Summary of Benefits and Coverage to define unfamiliar terms. Ask the insurer or a qualified benefits professional to clarify scenarios that matter to you.

Take the next step

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