
Coinsurer
A coinsurer is a company that shares some of the potential liability for covering a single policyholder. Just as a homeowner needs insurance to rebuild after a fire, an insurance company needs coinsurers and reinsurers to cover the costs of too many devastating fires breaking out at the same time. A coinsurer is one of two or more insurance companies that agrees to share direct responsibility for the payment of claims from a policyholder. Generally, a primary insurance company covers most of the cost of a major claim while a coinsurer takes responsibility for the rest. Reinsurance, also known as insurance for insurers or stop-loss insurance, is a transferral of a portion of responsibility to another party.

What Is a Coinsurer?
A coinsurer is a company that shares some of the potential liability for covering a single policyholder. The arrangement is most common when the risk or risks covered could be too costly for a single insurance company to cover.
Generally, a primary insurance company covers most of the cost of a major claim while a coinsurer takes responsibility for the rest.
[In health insurance, coinsurance is the share of the costs for care that is owed by the policyholder above and beyond the annual deductible amount. It is the insured person's co-pay for medical bills. For example, an 80-20 policy requires the policyholder to pay 20% of the medical bill while the insurance company picks up the rest.]



Understanding the Coinsurer
Coinsurers share in any claim or loss in proportion to the amount of risk that they take on.
They are most often used for policies covering large businesses and governments that could suffer a loss that is beyond the resources of any individual insurance company. After the attack on New York City's World Trade Center in 2001, seven insurers ultimately paid more than $4 billion in property damage claims.
The policyholder receives a separate contract from each coinsurer. To reduce the paperwork burden, the insurance company that undertakes the largest proportion of the claim serves as the leading insurer.
When Coinsurers Are Needed
Some types of policies, like industrial fire insurance, typically involve coinsurance because of the high dollar cost of the risks the policy covers.
State or federal laws dictate that some risks must be jointly insured by several coinsurers in order to adequately diversify the risk of a large claim.
Insurance companies share risks in various ways, sometimes passing part of the risk to a reinsurance company. Reinsurance, also known as insurance for insurers or stop-loss insurance, is a transferral of a portion of responsibility to another party. The reinsurer accepts responsibility for claims above a certain level in return for a share of the premium paid by the policyholder.
Coinsurance vs. Reinsurance
Reinsurance typically covers an insurance company against an unexpected accumulation of individual claims that would otherwise endanger its solvency.
A coinsurer is one of two or more insurance companies that agrees to share direct responsibility for the payment of claims from a policyholder. A reinsurer agrees to reimburse an insurance company for losses above an anticipated level.
Both practices allow insurers to underwrite policies for a larger number of clients without imperiling their financial stability. Just as a homeowner needs insurance to rebuild after a fire, an insurance company needs coinsurers and reinsurers to cover the costs of too many devastating fires breaking out at the same time.
Related terms:
Clash Reinsurance
Clash reinsurance provides risk management for primary insurers who may receive multiple claims from policyholders resulting from a single event. read more
Co-Reinsurance
Co-reinsurance is a contract to indemnify an insurer that is shared by multiple companies in order to reduce the potential cost of claims. read more
Excess Limits Premium
Excess limits premium is the amount paid for coverage beyond the basic liability limits in an insurance contract. read more
Out-of-Pocket Expenses
Out-of-pocket expenses are costs you pay from your own cash reserves, such as medical care and business trips, that may be reimbursable. read more
Quota Share Treaty
A quota share treaty is a pro rata reinsurance contract in which the insurer and reinsurer share premiums and losses according to a fixed percentage. read more
Underwriting Capacity
Underwriting capacity is the maximum amount of liability that an insurance company agrees to assume from its underwriting activities. read more