Definition:Certificate of insurance (COI)
📋 Certificate of insurance (COI) is a standardized document issued by an insurer or its authorized agent that provides third parties with a snapshot of an insured's active insurance coverage. Widely used in commercial transactions, the COI typically lists the named insured, policy numbers, coverage types, limits of liability, effective and expiration dates, and any additional insureds or special endorsements. It serves as proof of insurance without disclosing the full policy language, making it an efficient vehicle for satisfying contractual insurance requirements.
⚙️ The most recognized format in the United States is the ACORD 25 form for property and casualty coverage and the ACORD 28 for property evidence. A certificate holder — often a client, landlord, or project owner — requests the COI to verify that the party it is doing business with carries adequate insurance. The issuing broker or agent completes the certificate based on policy records and transmits it to the requesting party. Crucially, the COI itself does not alter, extend, or amend the underlying policy; any language on the certificate stating otherwise is generally considered non-binding. If a certificate holder wants actual coverage rights, such as additional insured status, a formal policy endorsement must be issued separately.
💡 Millions of COIs are generated annually across the U.S. insurance market, and the sheer volume has driven significant insurtech innovation. Digital COI platforms now allow insureds and brokers to issue, deliver, and track certificates in real time, replacing the fax-and-email workflows that once dominated. Automated certificate management systems on the recipient side verify coverage details against contractual minimums, flagging gaps before they become liability exposures. Despite their simplicity, COIs remain a frequent source of misunderstanding — parties sometimes treat them as guarantees of coverage, when in reality they are informational documents subject to the actual terms and conditions of the policies they reference.
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