Coinsurance

A cost-sharing arrangement in a health plan where the insurer pays one share of a covered expense and you pay the rest.

Reviewed by Kyle Garrett, licensed insurance advisorLast reviewed October 2026. How we write

Coinsurance is a cost-sharing arrangement in health insurance policies where the cost of covered healthcare services is split between the insurance company and the insured individual. It is typically expressed as a percentage: the plan pays a set share of each covered expense, and the insured person pays the rest.

Key aspects of coinsurance include:

  • Deductibles

    Depending on the plan, a deductible may apply first. The deductible is a fixed amount the insured must pay out-of-pocket before the insurance company starts paying its share of the costs.

  • Out-of-pocket costs

    Coinsurance is one of the main forms of out-of-pocket expenses for insured individuals, along with deductibles and copayments. The actual amount paid by the insured depends on the total cost of the service and the coinsurance rate.

  • Annual maximum in Quebec

    In Quebec, the public prescription drug plan and group plans set a maximum annual contribution for covered drugs; once you reach it, the plan pays the full cost of covered drugs for the rest of that year.

  • Variability

    The specific coinsurance rate can vary depending on the type of healthcare service received (for example, hospital stays, specialist visits, or prescription drugs).

Coinsurance is designed to encourage insured individuals to be more conscious of healthcare costs, as they share a portion of these costs. It is important for individuals to understand their insurance policy’s coinsurance rates, any deductibles and plan maximums to effectively manage their healthcare expenses.

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