Deductible, coinsurance and out-of-pocket max

Deductibles, coinsurance and out-of-pocket maximums show up on every health plan summary and on every life and health licensing exam. Each term is simple on its own. What confuses people is the order they apply in. Once you see that order, any cost-sharing question becomes a three-step calculation.

The three terms

• Deductible: the amount you pay for covered care before the plan starts sharing the cost.
• Coinsurance: after the deductible, the percentage of each bill you still pay. A plan described as "80/20" pays 80% and you pay 20%.
• Out-of-pocket maximum: the most you pay for covered care in the plan year. Once your deductible and coinsurance payments reach it, the plan pays 100% of covered costs for the rest of the year. Exam material sometimes calls this the stop-loss limit.

Premiums are separate. What you pay each month to keep the coverage never counts toward the deductible or the out-of-pocket maximum.

The order they apply in

For a covered bill:

1. You pay the bill until you've met the deductible.
2. Whatever is left is split by the coinsurance percentage.
3. Your total (deductible plus coinsurance) is capped at the out-of-pocket maximum. Anything above the cap is the plan's.

All the examples below use the same plan: a $1,500 deductible, 20% coinsurance, and a $5,000 out-of-pocket maximum, with the whole bill counted as covered, in-network care.

Example 1: a small bill

You have an $800 covered bill, and it's your first claim of the year.

The whole $800 falls under the deductible, so you pay $800 and the plan pays $0. You have $700 of deductible left to meet.

This is the most common surprise for people with a new plan: "I have insurance, why did I pay the whole thing?" Because the deductible comes first.

Example 2: a mid-sized bill

You have a $10,000 covered bill, and it's your first claim of the year.

• Deductible: you pay the first $1,500.
• Remaining: $10,000 - $1,500 = $8,500.
• Coinsurance: you pay 20% of $8,500 = $1,700. The plan pays 80% = $6,800.
• Your total: $1,500 + $1,700 = $3,200. That's under the $5,000 cap, so the cap doesn't apply.

Check: $3,200 + $6,800 = $10,000.

Example 3: a large bill

You have a $40,000 covered bill, and it's your first claim of the year.

• Deductible: $1,500.
• Remaining: $40,000 - $1,500 = $38,500.
• Coinsurance before the cap: 20% of $38,500 = $7,700.
• Uncapped total: $1,500 + $7,700 = $9,200. That's over the $5,000 maximum.
• So you pay $5,000, and the plan pays $40,000 - $5,000 = $35,000.

Where the cap kicks in

On this plan, you can find the bill size where you hit the maximum by working backward. You've paid $1,500 of deductible, which leaves $3,500 of room under the cap. At 20% coinsurance, $3,500 of your share corresponds to $3,500 / 0.20 = $17,500 of bills after the deductible. Add back the deductible: $17,500 + $1,500 = $19,000.

So on this plan, any year with more than $19,000 of covered bills costs you exactly $5,000. That's why the out-of-pocket maximum matters more than the deductible to someone planning for a major surgery or a chronic condition.

Where copays fit

A copay is a flat dollar amount for a specific service, like a set fee for an office visit, instead of a percentage. Many plans use copays for routine visits and prescriptions, and the deductible plus coinsurance for bigger costs. Whether a given copay counts toward your out-of-pocket maximum is spelled out in the plan's summary of benefits, so check it there rather than assuming.

How it shows up on a licensing exam

Life and health exams test this two ways. Definition questions ask you to tell a deductible from coinsurance or to name the stop-loss feature. Scenario questions give you a plan and a bill and ask what the insured pays, exactly like the examples above. The common wrong answer applies coinsurance to the whole bill and forgets to take the deductible out first. Here's the check with Example 2's plan: 20% of $10,000 is $2,000, so the wrong answer is $2,000 in coinsurance, where the right figure is $1,700 on the $8,500 left after the deductible.

Medicare Part B is a real-world case of the same pattern: after the annual deductible, you typically pay 20% of the Medicare-approved amount.

The health insurance cost-sharing calculator runs this calculation for any deductible, coinsurance rate, out-of-pocket maximum and bill. If you're preparing for the Texas exam, what's on the Texas life and health exam shows where cost-sharing sits in the outline, how to study for the Texas life and health exam covers the plan, and the free Texas Life and Health course drills these terms along with the rest of the 1,101 cards.