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Anybody can help to provide the definition of "Co-Insured" and "Additional Insured" to me?

TKS in advance!!!

You have to read each policy form to see how each carrier defines it. And be careful to read everything, as they often give and take away coverages in the various endorsements.

I have not find any definition in any policy, can anybody provide this?

I think the terminology may be a bit different than what I would use. Think " Named Insured" and "Additional Insured". A Named Insured" has all of the coverages on the policy afforded to him. An "Additional Insured" has specific coverages provided for them, i.e GL, AL, etc., and depending on how endorsed onto the policy for a specific job or time frame. A lot of contractors policies, in my neck of the woods, has a Blanket AI by Contract endorsement in their policy. So the policy responds based on the contract the insured signed, as long as it is within the policy terms.

The normal wording I use on a cert. of insurance for and AI is: The cert. holder is named as AI, under the GL policy, with regards to work performed by or on behalf of the named insd........

You never want to make anyone a named insured other then the insured and it's entities, unless you are talking about and OCP policy.

Hope that helps some.

I have never heard the term "Co-Insured". Where are you seeing this term?

Also, Additional Insured would be defined by the specific Additional Insured endorsement that is on the policy.

I believe "Co-Insured" is a term lawyers invented.

Willing to bet that they mean Co-Insurance

Always name a specific entity as AI when preparing a certificate. Never insert the wording "holder is AI". There apparently exists a court interpretation that any entity or individual possessing the typed certificate is by definition the "holder". But it goes without saying that using "holder" is definitely ambiguous and can be used by any entity (that wants to be considered as AI) to prove their case. For decades I have seen too many certs that state "holder is AI". Incompetency is rampant in our industry and must be eliminated. signed - certificate police

Ok back to insurance 101. Co-insured refers to another named insured - (two corps with exact same ownership covered on the same policy) not always doing the same business either. Can be tricky because they would share the same limits.
Additional insured is an entity that is added to a policy for specific coverage - a landlord, a general contracor/sub contractor, property management company, mortgagee/loss payee. Unlike the co-insured an additional insured has limited liability under the policy.

Co-insured Doctrine - look it on Google Legal Scholar. It concerns, for example, an apartment house or a condominium association which suffers damage caused by a tenant or a unit owner. The master policy of the apartment house or the condominium covers the damage,thus making the tenant and/or unit owner a "co-insured." As such, a separate damage claim cannot made against the tenant or owner who caused the damage--HE IS A CO-INSURED UNDER THE MASTER POLICY. The master has to cover him without seeking reimbursement.

Now can anyone tell me what happens when an insurance company subrogates on such a policy in Washington State when WA has the co-insured doctrine. I think such a release is invalid. And why doesn't the actual policy holder have a say before its insured goes issuing such releases?