CGL Coverages A, B, and C (and What Occurrence Means)

Updated October 1, 2026.

Commercial general liability (CGL) is the workhorse third-party liability form for businesses, contractors, and many nonprofits. It is not one blanket promise to pay; it is three separate coverage grants, each with its own trigger, limits, and exclusions. If you only read the declarations page, you will miss where the policy actually responds—and where it does not.

This guide walks through Coverages A, B, and C on the ISO CGL form, what occurrence means in practice, exclusions that routinely surprise insureds, and how primary CGL limits combine with umbrella and excess liability layers. For the wider liability picture, see the complete liability coverage guide.

How ISO CGL is organized

Most admitted-market CGL policies follow ISO form CG 00 01 (or a carrier variant filed from it). The policy splits into:

• Coverage A — Bodily Injury and Property Damage Liability
• Coverage B — Personal and Advertising Injury Liability
• Coverage C — Medical Payments

Each coverage has its own insuring agreement, supplementary payments (chiefly under A), and a shared exclusion section. Endorsements can add insureds, narrow exclusions, or change triggers—but the A/B/C skeleton is what every risk manager should memorize before reviewing a renewal.

Coverage A: Bodily injury and property damage

Coverage A responds when the insured is legally obligated to pay damages because of bodily injury or property damage caused by an occurrence during the policy period. “Bodily injury” includes sickness, disease, and death. “Property damage” includes physical injury to tangible property, loss of use of tangible property that is physically injured, and certain defined losses.

What triggers Coverage A

The trigger is occurrence-based: the harmful event (or continuous/repeated exposure) must happen during the policy period, even if the lawsuit arrives years later. That long tail is why contractors care about completed operations and why carriers care about when work was performed—not just when a claim is filed.

Coverage A also pays defense costs, typically outside the limits in standard ISO wording (check your form edition and any endorsements that erode limits). Supplementary payments can include bond premiums, appeal costs, and reasonable expenses at the insurer’s request.

Limits that matter on Coverage A

Declarations show several buckets. The ones that drive most coverage disputes:

• Each occurrence limit — cap for any one occurrence under Coverage A (and usually B, unless split).
• General aggregate limit — cap for Coverage A (except products-completed operations) during the policy period.
• Products-completed operations aggregate — separate cap for products and completed operations claims.

How those buckets interact with deductibles, SIRs, and excess layers is covered in limits, deductibles, and claim recovery mechanics.

Coverage B: Personal and advertising injury

Coverage B is not a second copy of Coverage A. It covers offenses listed in the definition of personal and advertising injury—such as false arrest, wrongful eviction, certain oral or written publications that slander or libel, and select advertising wrongs—when caused by an offense committed in the course of the insured’s business during the policy period.

The trigger language differs from Coverage A. You are matching the offense to the policy period in force when the act happened, not re-litigating bodily injury “occurrence” facts. Marketing teams, property managers, and anyone publishing content should know which offenses are in the definition—and which were removed or restricted in recent ISO revisions.

Personal and advertising injury shares the “each occurrence” limit shown on the declarations unless endorsed otherwise. It does not use the products-completed operations aggregate, but it still consumes the general aggregate.

Coverage C: Medical payments

Coverage C is a modest no-fault medical pay provision. It pays reasonable medical expenses for bodily injury caused by an accident on premises the insured owns or rents, or because of the insured’s operations, without requiring a lawsuit or admission of liability.

Limits are small compared with Coverage A—often $5,000 or $10,000 per person. The value is speed and goodwill: triage bills before they become BI suits. Coverage C is subject to its own exclusions (workers compensation, athletic activities, certain vehicle exposures, etc.) and does not replace health insurance or workers comp.

What “occurrence” means (and why it is not claims-made)

Under CG 00 01, an occurrence means an accident, including continuous or repeated exposure to substantially the same general harmful conditions. That definition does three jobs at once:

• It ties Coverage A to an event or ongoing exposure—not to the date a claimant files suit.
• It allows “long tail” claims (construction defects, gradual leaks, toxic exposure patterns) to locate in the policy period when the exposure happened, subject to policy wording and state law.
• It distinguishes CGL from true claims-made forms used for professional liability, employment practices, and many management lines.

Occurrence policies: trigger looks to when the bodily injury or property damage occurs (or is deemed to have occurred). A claim reported in 2026 for a 2024 job site incident generally runs to the 2024 policy, if that policy is still available and not barred by statute or contract.

Claims-made policies: trigger looks to when the claim is first made and reported during the policy period (and after any retroactive date). Letting a claims-made policy lapse without tail coverage can permanently orphan prior work. Standard CGL Coverage A does not work that way—do not teach your team that it does.

Some specialty lines attached to a CGL program may still be claims-made. When you map triggers across a commercial insurance program, label each form explicitly.

Exclusions you should expect on every review

Exclusions are where coverage analysis actually happens. On a typical ISO CGL, prioritize:

• Expected or intended injury — deliberate acts are not insurable as liability.
• Contractual liability — assumed liability in a contract is excluded except for defined “insured contracts.”
• Employer’s liability / workers compensation — employee BI belongs in workers comp, not CGL.
• Pollution — largely excluded on standard CGL; buy environmental or pollution forms if exposure exists.
• Professional services — CGL is not E&O; design, advice, and professional errors need their own form.
• Damage to your product, your work, and impaired property — business risk exclusions that push quality disputes back to the contract.
• Electronic data, recording and distribution of material in violation of law — cyber and media gaps often need separate policies.

Carrier manuscript endorsements and state variations can reinstate or broaden coverage. A line-by-line comparison belongs in ISO form and endorsement analysis, not a once-over on the dec page.

How CGL limits stack with umbrella and excess

Primary CGL limits exhaust first. A following-form umbrella or excess layer attaches after the underlying CGL limits are used up for a covered occurrence, provided the loss matches the underlying terms and the umbrella schedule lists CGL as underlying.

Stacking is vertical, not a replacement of primary limits. Example: $1 million each occurrence on CGL plus $3 million following-form umbrella scheduled over that CGL is $4 million of vertical limit for a covered occurrence—not $3 million total. Contract certificates often require you to show that math explicitly.

Underwriters in 2025–2026 renewals have paid closer attention to whether primary limits still match severity trends—especially for habitational, transportation, and construction accounts facing higher judgment exposure. That pressure sits in the broader social inflation and nuclear verdict cycle reshaping liability pricing, not in a single endorsement on your CGL.

Umbrella policies may also impose minimum underlying limits and require the CGL to stay in force. Dropping primary limits to save premium can void umbrella attachment even when no claim has happened.

Practical steps to review a CGL policy

1. Read declarations and schedules first — named insured, locations, class codes, limits, deductibles/SIR, forms list, additional insureds, and mortgageholders/loss payees if any.
2. Confirm Coverage A is occurrence — verify form edition (CG 00 01) and that no endorsement converts BI/PD to claims-made (rare on standard CGL, but check manuscript packages).
3. Map aggregates to your jobs — one bad year can burn the general aggregate; products-completed ops aggregate matters for contractors and manufacturers.
4. Match exclusions to operations — subs, height, heat, residential, liquor, pollution, and professional activities each have endorsement paths.
5. Align certificates and contracts — additional insured, primary and noncontributory, waiver of subrogation, and notice requirements must match what you signed.
6. Document the policy structure — use a consistent method to read insuring agreements, exclusions, and conditions; the walkthrough in how to read an insurance policy applies directly to CGL.

State insurance departments and the NAIC continue to monitor commercial liability affordability and form filing activity; when a filing changes defined terms or exclusions in your state, your renewal packet—not a blog summary—is the authoritative source.

Frequently asked questions

Is standard ISO CGL occurrence or claims-made?

For Coverage A bodily injury and property damage, standard ISO CGL (CG 00 01) is written on an occurrence basis. Coverage B personal and advertising injury is triggered when the offense is committed during the policy period. Coverage C medical payments pays within its limits without requiring fault. Professional liability, errors and omissions, and many management liability forms are claims-made; treating standard CGL the same way is a common review error.

What is the difference between Coverage A and Coverage B on a CGL?

Coverage A pays damages because of bodily injury or property damage caused by an occurrence. Coverage B pays because of personal and advertising injury caused by an offense listed in the policy definitions. The triggers and definitions differ; a claim can implicate one coverage, both, or neither depending on the facts and exclusions.

Does Coverage C mean we admitted fault?

No. Coverage C is a limited medical payments provision. It can pay reasonable medical expenses arising from a covered accident without a determination of legal liability. Payments are capped by the medical expense limit and are subject to Coverage C exclusions.

How does an umbrella sit on top of CGL limits?

A scheduled following-form umbrella or excess layer responds after the underlying CGL limits are exhausted for a covered occurrence, up to the umbrella limit. If the CGL provides $1 million each occurrence and a $3 million umbrella is properly scheduled above it, the combined vertical limit for a covered loss is $4 million—not $3 million.

Which CGL exclusions surprise businesses most often?

Common gaps include assumed contractual liability outside insured contracts, damage to the insured’s own work or product, professional services, pollution, and employee injuries meant for workers compensation. Expected or intended injury and unlawful conduct exclusions also bar coverage for deliberate acts.

Why does the occurrence definition matter for old projects?

Because Coverage A keys off when bodily injury or property damage occurs—or when continuous or repeated exposure happens—not when a lawsuit is filed. Long-completed work can still generate claims that attach to the policy period when the occurrence took place, subject to policy wording, statutes of limitation, and available records.