Co-insurance: Definition and Both Meanings
Usually several insurers sharing one big risk. Sometimes the insured sharing each claim.
Co-insurance has two meanings, and IC-01 expects you to know which one a question is using. In the first, two or more insurers share one large risk, each taking a fixed percentage, with one of them acting as the leader. In the second, the policyholder shares each claim with the insurer, as with a co-payment in health insurance.
Both are about sharing a loss. What differs is who is sharing it: insurers with each other, or the insured with the insurer.
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Meaning 1: insurers sharing one risk
Some risks are too large for one insurer to accept alone: a power plant, a port, a big factory. The client or broker places the risk with several insurers at once. Each one agrees to a share, say 50%, 30% and 20%, and is liable only for its own share of premium and claims, not for the others' shares.
One insurer is the lead insurer. It usually issues the policy, sets terms, collects premium and handles the claim, and then recovers each follower's share from that follower. IRDAI's actuarial and finance master circular uses exactly these words, lead insurer and follower, when it deals with co-insurance balances.
Worked example: three insurers on one factory
Illustration only. A textile mill in Coimbatore is insured for ₹300 crore against fire. A fire causes an admitted loss of ₹45 crore.
Lead insurer
Share
50%
Pays on the ₹45 crore loss
₹22.5 crore
Follower A
Share
30%
Pays on the ₹45 crore loss
₹13.5 crore
Follower B
Share
20%
Pays on the ₹45 crore loss
₹9 crore
Total
Share
100%
Pays on the ₹45 crore loss
₹45 crore
| Insurer | Share | Pays on the ₹45 crore loss |
|---|---|---|
| Lead insurer | 50% | ₹22.5 crore |
| Follower A | 30% | ₹13.5 crore |
| Follower B | 20% | ₹9 crore |
| Total | 100% | ₹45 crore |
Meaning 2: the policyholder sharing each claim
In health insurance this is the co-payment. IRDAI's Customer Information Sheet defines co-payment as a specified amount or percentage of the admissible claim amount to be paid by the policyholder. If a policy has a 20% co-payment and the admissible hospital bill is ₹2,00,000, the insurer pays ₹1,60,000 and the policyholder bears ₹40,000.
In property insurance, especially in American usage, a "coinsurance clause" means the insured must carry a sum insured close to the full value or bear part of each loss. In Indian general insurance that idea appears as the condition of average, which is covered on its own page.
Principles of insurance basics in the exam style. No signup.
Do not mix these up
Co-insurance (insurers)
Who shares the risk
Several insurers, each a fixed share, under one lead
Does the insured know?
Yes: the arrangement is set when the policy is placed
Contribution
Who shares the risk
Insurers of separate policies the insured happened to buy on the same risk, sharing after a loss
Does the insured know?
Yes: the insured bought each policy
Reinsurance
Who shares the risk
The direct insurer passes part of its risk to a reinsurer
Does the insured know?
No: the contract is between the two insurers only
Co-payment
Who shares the risk
The insured bears a set part of each admissible claim
Does the insured know?
Yes: stated in the policy
Deductible
Who shares the risk
The insured bears a fixed first amount; the insurer pays above it
Does the insured know?
Yes: stated in the policy
| Concept | Who shares the risk | Does the insured know? |
|---|---|---|
| Co-insurance (insurers) | Several insurers, each a fixed share, under one lead | Yes: the arrangement is set when the policy is placed |
| Contribution | Insurers of separate policies the insured happened to buy on the same risk, sharing after a loss | Yes: the insured bought each policy |
| Reinsurance | The direct insurer passes part of its risk to a reinsurer | No: the contract is between the two insurers only |
| Co-payment | The insured bears a set part of each admissible claim | Yes: stated in the policy |
| Deductible | The insured bears a fixed first amount; the insurer pays above it | Yes: stated in the policy |
How the exam tests this
IC-01 questions typically describe an arrangement and ask you to name it. "Three insurers each accept a percentage of a refinery risk, led by one of them" is co-insurance. "An insurer passes 60% of a risk it has accepted to another company" is reinsurance. The trap is choosing reinsurance for the first: in co-insurance every insurer faces the insured directly.
A second trap mixes co-payment with deductible. A co-payment is a share (often a percentage) of each claim; a deductible is a fixed amount the insured bears first.
FAQs
What is the definition of coinsurance?expand_more
In insurer terms, co-insurance is two or more insurers sharing one risk in agreed percentages, with one acting as lead insurer. In policyholder terms it means the insured bearing part of each claim, such as a co-payment in health insurance.
What is a lead insurer in co-insurance?expand_more
The insurer that usually issues the policy, sets the terms, collects premium and handles claims for all the co-insurers, then recovers each follower's share from that follower.
What is the difference between co-insurance and reinsurance?expand_more
In co-insurance, several insurers each take a direct share of the risk from the insured. In reinsurance, one insurer accepts the risk and then passes part of it to a reinsurer; the insured deals only with the first insurer.
Is co-payment the same as co-insurance?expand_more
Co-payment is the health insurance form of the policyholder-sharing meaning. IRDAI defines it as a specified amount or percentage of the admissible claim that the policyholder pays.
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