By Matthew Kimball · MK Health Advisors · Arizona license #21307301
Published September 9, 2026
Coinsurance is the percentage of a covered service’s allowed cost that you pay, usually after meeting the deductible that applies to that service. If your share is 20%, you pay $200 on a $1,000 allowed amount once that deductible is met, assuming you have not reached your applicable out-of-pocket limit.
For Arizona individuals, families, and self-employed professionals, this percentage helps explain why bills can continue after the deductible. The useful question is not just “What is my coinsurance?” It is “What amount is that percentage applied to, and when does it stop?”
Coinsurance, copays, and deductibles: three different jobs
A deductible is an amount you pay for services subject to it before the plan shares those costs. A copay is a fixed dollar charge for a covered service. Coinsurance is a percentage, so the dollar amount changes with the allowed cost. A monthly premium is separate: you pay it to maintain coverage.
One policy may use copays for office visits and coinsurance for other care. Read the service-specific terms rather than assuming one rule applies everywhere. Our deductible guide explains the first part of this comparison. See also HealthCare.gov’s guide to total health care costs.
What does 20% coinsurance mean in dollars?
Illustration only—not a quote or an available plan: assume a covered in-network service has a $1,000 allowed amount, your deductible is already met, your share is 20%, and you have at least $200 left before your applicable out-of-pocket maximum. You pay $200 and the plan pays $800.
That example uses the allowed amount, not necessarily the provider’s original billed charge. Check which amount your benefit summary uses and whether the provider is in network. HealthCare.gov explains allowed amounts, and its coinsurance definition describes the percentage calculation.
What if you still owe part of your deductible?
Using a separate hypothetical example, suppose the same service has a $1,000 allowed amount but you have $400 of deductible left. Assume the entire service is subject to that deductible, followed by 20% coinsurance, and the out-of-pocket limit does not reduce your share.
First, you pay the remaining $400 deductible. That leaves $600 to split. Your coinsurance is 20% of $600, or $120. Your total for this service is $520: $400 plus $120. The plan pays the remaining $480.
This is why multiplying the entire amount by 20% can underestimate a bill when the deductible has not been met. Actual claims can involve different service categories or separate prescription deductibles. Ask the insurer how the specific benefit applies.
Does coinsurance stop at the out-of-pocket maximum?
For covered in-network benefits subject to your plan’s out-of-pocket maximum, eligible deductibles, copays, and coinsurance count toward that limit. Once you reach it, the plan pays the covered in-network benefit costs for the rest of the plan year.
The limit does not cover every expense. Premiums, excluded services, and certain out-of-network or above-allowed charges remain outside it. A lower coinsurance percentage is not a substitute for checking these boundaries. Review what HealthCare.gov says the out-of-pocket limit excludes.
How to read coinsurance in a plan comparison
Start with the Summary of Benefits and Coverage (SBC). Find the rows for care you expect to use, such as specialist visits, imaging, hospital care, or prescriptions. Check the in-network column, whether the deductible applies, and the limitations beside that row. Learn about the SBC and where to find it.
Then ask these questions before choosing:
- Is the listed percentage my share or the insurer’s share?
- Are my providers and prescriptions covered under this exact plan?
- Does this service have a copay, coinsurance, or both?
- How much deductible would I have left when I need the service?
- Which payments count toward the out-of-pocket maximum?
- Are there exclusions, benefit limits, or authorization requirements?
Compare the whole household budget: premiums, expected care, and a year with larger medical costs. Our Arizona cost guide helps organize that decision. If your income varies, our self-employed coverage guide adds considerations for business owners.
Common coinsurance questions
Does 0% coinsurance mean all care is free?
No. Check whether a deductible must be met first and whether the service is covered. Premiums, copays, and excluded expenses can still apply. “0%” describes a particular cost-sharing provision, not every obligation under the policy.
Is 20% coinsurance always better than 30%?
For the same allowed amount under otherwise identical terms, 20% is a smaller share. But plans can differ in premiums, deductibles, networks, and limits. A percentage by itself cannot establish which plan fits your needs or costs less overall.
Does a PPO label tell me my coinsurance?
No. Check the exact policy and its network benefits. The network label does not answer what the policy covers or what you will owe. Read our private coverage and Marketplace comparison when evaluating different types of coverage.
Review your coverage with Matt
Bring your plan’s benefit summary and questions to a free initial consultation. Matthew Kimball helps Arizona adults under 65, families, and business owners compare suitable options and understand the costs. There is no advisory fee; Matthew is compensated by insurance carriers.
Book a free initial consultation, request a personalized comparison, or call (480) 955-6578.
General educational information. The examples are hypothetical and do not represent available plans. Coverage, eligibility, networks, and costs vary by policy. The written policy controls coverage.