An insurance endorsement is a written amendment to an insurance policy that formally modifies the terms of coverage. Endorsements can add coverage, remove coverage, change limits, add or remove parties, or modify conditions. They are part of the policy contract and carry the same legal weight as the base policy.
An insurance endorsement is a written amendment to a policy that formally modifies coverage terms - adding coverage, removing it, changing limits, or adding parties. It carries the same legal weight as the base policy and is what actually creates the protections contracts require.
In contract compliance, endorsements are what actually create the protections that contracts require. A certificate of insurance can note that an additional insured endorsement exists - but it is the endorsement itself that extends coverage. Understanding this distinction is the difference between confirming compliance and assuming it.
Why Endorsements Matter More Than COI Notations
The standard ACORD 25 form contains explicit language stating that the certificate "does not affirmatively or negatively amend, extend or alter the coverage afforded by the policies." This means that when a broker writes "additional insured included" in the description of operations box, that notation does not itself create coverage. The endorsement on the underlying policy does.
If an endorsement was never issued - because the broker made a mistake, because the insurer declined to add it, or because the vendor requested the COI without going through the proper process - the notation on the certificate is meaningless. The coverage does not exist.
This is not a theoretical risk. Endorsements are sometimes noted on certificates without being present on the actual policy. Discovering this absence typically happens when a claim is filed and the insurer denies it because the endorsement was never issued.
Types of Endorsements Relevant to Contract Compliance
Additional insured endorsements. These add a specified party to the policy as an insured, extending defense and indemnity to that party for claims arising from the named insured's operations. Common forms include ISO CG 20 10 (ongoing operations) and CG 20 37 (completed operations).
Waiver of subrogation endorsements. These modify the policy to prohibit the insurer from pursuing recovery against a specified party after paying a claim. Must be separately issued for each coverage line where it is required.
Primary and non-contributory endorsements. These modify the "other insurance" clause to designate the policy as primary and prevent the insurer from seeking contribution from other available coverage held by the additional insured.
Notice of cancellation endorsements. Standard policies provide limited cancellation notice rights to certificate holders. Endorsements can extend this notice period (commonly 30 days) and address what constitutes adequate notice.
Blanket endorsements. Rather than naming specific parties, blanket endorsements automatically extend coverage (additional insured, waiver of subrogation, etc.) to any party the named insured is required by written contract to so include. These are efficient but require a valid written contract to trigger.
Endorsement Form Numbers
Major endorsements are identified by form number - a standardized identifier that communicates exactly what the endorsement does. Insurance Services Office (ISO) publishes the most widely used standard forms. When a contract specifies a particular endorsement form, it is specifying exactly what terms must be in place.
Examples:
- CG 20 10 - Additional Insured, Owners, Lessees or Contractors (Ongoing Operations)
- CG 20 37 - Additional Insured, Owners, Lessees or Contractors (Completed Operations)
- CG 20 26 - Additional Insured, Designated Person or Organization
- CA 20 01 - Additional Insured - Lessor
Many insurers use proprietary forms rather than ISO forms. Proprietary forms may provide broader or narrower coverage than the comparable ISO form. When a contract specifies ISO form numbers, a proprietary form substitute requires scrutiny.
How Endorsements Appear on COIs
Endorsements are referenced on a COI in two ways:
- Description of operations box - the broker notes the endorsement and its form number, or describes the coverage modification in plain language
- Checkboxes - some ACORD forms include specific checkboxes for common endorsements (additional insured, waiver of subrogation)
Neither method confirms the endorsement was actually issued. To confirm an endorsement exists, request a copy of the endorsement from the vendor's broker. For high-stakes contracts, this is standard practice.
When to Request Endorsement Copies
For any of the following situations, request the actual endorsement:
- The contract specifies a particular endorsement form number
- The COI notes the endorsement in vague language without a form number
- The contract value or risk exposure is high
- The counterparty has a history of compliance issues
- The endorsement is for a provision that is particularly material to your risk (e.g., completed operations additional insured on a construction project)
How Bramble Helps
Bramble identifies endorsement requirements in your contracts - including specified form numbers - and checks whether submitted COIs reference those endorsements. When the COI is vague, silent, or references a different form than specified, Bramble flags it for follow-up. This converts endorsement verification from a manual, document-by-document process into an automated compliance check.
Visit getbramble.com to see how Bramble handles contract-vs-COI compliance end to end.