Deductible, Copay, Coinsurance and Out-of-Pocket Maximum, Explained Properly

The options around the cost-sharing structure of American health insurance are set out side by side below, with the conditions that genuinely favour one over the other.

The premium is only the beginning

The premium is what you or your employer pay each month to hold the policy, and it buys access rather than free care. After that, most plans share costs with you through a sequence of mechanisms that apply in a particular order.

This is why two plans with the same premium can produce wildly different bills for the same treatment. Comparing plans on premium alone is the most common and most expensive mistake in this area. The four terms below are the whole structure, and understanding them makes plan documents readable.

The deductible

The deductible is an amount you pay yourself each plan year before the insurer starts paying its share for most services. Until it is met, you generally pay the full negotiated price for covered services rather than nothing at all.

Certain services, often including preventive care, are frequently covered before the deductible is met, and the list is in the plan documents. Family plans typically have both individual and family deductibles, and how they interact varies between plans. A high deductible plan trades a lower premium for higher exposure if you actually need care, which is a real trade rather than a trick.

Copays and coinsurance

A copay is a fixed amount for a specific service, such as a set sum for a visit to a doctor, paid at the time. Coinsurance is a percentage of the cost that you pay after the deductible is met, with the insurer paying the remainder. The difference matters because a percentage of an expensive procedure is unpredictable while a fixed copay is not.

Once the paperwork clears, plans mix the two, applying copays to routine services and coinsurance to larger ones, and the details are in the summary of benefits. Both are calculated on the negotiated price rather than on the amount originally billed, which is usually far lower.

The out-of-pocket maximum

The out-of-pocket maximum is the most you will pay in a plan year for covered in-network services, after which the plan pays everything. It includes the deductible, copays and coinsurance, and it generally excludes premiums.

This figure is the one that actually measures your worst case, which is why it matters more than the deductible when comparing plans. Out-of-network care is often subject to a separate and much higher maximum, or to none at all.

Anyone with a known ongoing condition should compare plans primarily on this number rather than on the premium.

Networks and formularies

Insurers negotiate prices with a network of providers, and using providers outside that network costs dramatically more or is not covered. Plans differ in how large their networks are and whether they cover any out-of-network care at all.

The thing nobody tells you: prescription cover works through a formulary, a list of covered medicines organised into tiers with different costs. If you take a regular medicine, checking the formulary before choosing a plan is essential rather than optional. Networks and formularies change between plan years, so an annual check is worth the twenty minutes.

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Choosing between plans

Estimate your likely use, then calculate total annual cost as premiums plus expected cost sharing, and compare the worst case too. Employers usually offer a choice during an annual enrolment window, and outside that window changes generally require a qualifying life event. Tax-advantaged accounts for medical spending exist alongside certain plan types, and their rules and limits change annually.

Once the paperwork clears, coverage for dependants varies enormously in cost between employers, which matters when comparing job offers. This article explains vocabulary and nothing more; for decisions about coverage or care, consult the plan documents and appropriate professionals.

Side by side

The takeaway

Compare plans on the out-of-pocket maximum and the network, not on the premium. This article is general information, not medical or insurance advice.

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