A certificate of insurance (COI) is a one-page document that proves a policy is in force, showing coverage types, limits, dates, and additional insureds. It is evidence of coverage, not coverage itself.
A certificate of insurance (COI) is a one-page document that proves an insurance policy is in force. It lists the coverage types, limits, policy dates, and any additional insureds on the account. Brokers issue it on the insurer's behalf, most often on the ACORD 25 form. A COI is evidence of coverage, not the coverage itself.
For a commercial P&C underwriter or MGA, certificates arrive inside submissions as proof of prior and concurrent coverage. Read them wrong and the file misstates the risk transfer behind the account. This entry defines the COI, shows what it carries, and explains why its accuracy is an exposure question, not a filing task.
What is a certificate of insurance (COI)?
A COI is a summary snapshot of an active policy. It confirms that a named insured holds coverage, and it states the limits, the carrier, and the dates. The standard version is the ACORD 25 form, published by ACORD, the insurance industry's standards body. A broker or agent issues the certificate at a point in time. It does not change when the underlying policy changes.
That last point matters. A certificate is a photograph, not a live feed. It tells you what was true on the day it was issued.
What does a certificate of insurance show?
A COI packs the key policy facts into set fields. Each field answers a different underwriting question. The table below maps what the certificate lists to what it tells the reader.
| Field on the COI | What it tells the reader |
|---|---|
| Insurers affording coverage | Which carriers stand behind the risk, checked against their AM Best financial-strength rating |
| Coverage types and limits | The general liability, auto, umbrella, and workers compensation cover available, and how much |
| Policy numbers and dates | Whether each policy is currently in force or already expired |
| Additional insured and waiver of subrogation | Whether the certificate holder shares in the coverage, if the policy endorsement grants it |
| Description of operations | The specific job or contract the coverage is tied to |
| Certificate holder | Who the certificate was issued to and who is relying on it |
Certificates travel with commercial submissions, alongside ACORD forms and loss runs. Each one carries live facts that shape risk selection.
How is a COI different from the policy itself?
The certificate summarizes the policy; it does not grant or change coverage. It confers no rights on the holder and does not amend the terms. Additional insured status comes from a policy endorsement, not from a line typed on the certificate. So the document can read clean while the coverage behind it is narrower.
This gap is where files go wrong. A limit shown on the certificate can be capped by a sublimit inside the policy. The worked example shows the size of that gap.
| Risk transfer on a $2,000,000 claim | Amount |
|---|---|
| General liability limit shown on the certificate | $2,000,000 |
| Operation-specific sublimit written into the policy | $500,000 |
| Amount the policy actually pays | $500,000 |
| Gap the certificate holder retains | $1,500,000 |
Why does a misread or expired COI create exposure?
A certificate is only true on the day it is issued. The policy behind it can be cancelled the next week. A carrier can cancel a policy for non-payment mid-term, and the certificate on file still shows coverage running to year end. A loss in that window has no coverage, even though the paper says otherwise. The certificate never updated.
The same risk sits in the reading. A limit, an expiration date, or an additional-insured line copied wrong from the certificate misstates the account. For an underwriter, that error travels into risk selection and pricing. For a risk or compliance team, it leaves a contractual gap no one priced for. Accuracy at this step is a control on real exposure.
How do carriers and MGAs process certificates accurately at scale?
Accurate certificate data starts with reading the document, not retyping it. Certificates arrive as ACORD 25 PDFs across hundreds of broker layouts, and manual keying drops limits and dates. Pibit.AI reads ACORD documents with template-agnostic extraction through DocumentCURE, then a managed human-in-the-loop team validates every field. The output carries 99.9 percent contractual field-level accuracy, so the limits, carriers, and dates in the file match the certificate. That keeps risk selection tied to what the coverage actually says, the same first-mile discipline behind clean broker email submission intake. It is also how carriers surface the underwriting intelligence hidden in ACORD documents instead of leaving it in a PDF.
Frequently asked questions
What is a certificate of insurance (COI)?
A certificate of insurance (COI) is a one-page document that proves an insurance policy is in force. It lists the insurers, the coverage types and limits, the policy numbers, and the effective and expiration dates, usually on the ACORD 25 form. A broker issues it on the insurer's behalf. It summarizes the policy but does not grant or change coverage.
What is the difference between a certificate of insurance and the policy?
The certificate summarizes the policy; the policy is the contract. A COI confers no rights on the holder and does not amend the terms. Additional insured status and any sublimits come from the policy and its endorsements, not from the certificate. So a certificate can show a headline limit that the policy narrows, which is why underwriters treat it as evidence to verify rather than the coverage itself.
Why can an expired or misread certificate of insurance create exposure?
A certificate is only accurate on the day it is issued, and the policy behind it can be cancelled later. A COI on file can still show coverage after a carrier cancels the policy for non-payment, leaving a loss in that window uncovered. Copying a limit, date, or additional-insured line wrong from the certificate misstates the risk transfer. Accurate extraction keeps the file tied to what the coverage actually says.
