Coverage Disputes: Is Your Loss Covered at All?

Before you can argue about how much an insurance company should pay, you must first establish that the loss is covered at all. Coverage disputes are the most fundamental type of insurance claim disagreement. They come before scope disputes, before valuation disputes, and before any discussion about the amount of payment. If your insurer says the loss is not covered, none of those other conversations matter until the coverage question is resolved.

Common Types of Coverage Disputes

Coverage disputes arise in several forms, each with different legal and factual issues:

• Cause of loss: The insurer agrees damage exists but disputes what caused it. For example, the insurer may claim water damage was caused by a long-term leak (maintenance issue, not covered) rather than a sudden pipe burst (covered). Or the insurer may attribute storm damage to pre-existing wear and tear.
• Excluded perils: The insurer acknowledges the cause but argues it falls under a specific exclusion in the policy — such as earth movement, flood, mold, or intentional acts.
• Policy not in force: The insurer claims the policy had lapsed due to nonpayment of premium, was cancelled, or was never effective at the time of the loss.
• Timely reporting: The insurer argues that the loss was not reported within the time required by the policy, and that late reporting prejudiced their ability to investigate.
• Failure to comply with policy conditions: The insurer claims you failed to meet a condition required for coverage, such as submitting a proof of loss or cooperating with the investigation.

Burden of Proof: Who Must Prove What

The burden of proof in a coverage dispute depends on the type of policy you have. This is a critical distinction that many policyholders do not understand:

With an open peril policy(also called "all risk" or "special form" — the HO-3 is the most common), coverage applies to all causes of loss unless specifically excluded. Under this type of policy, the policyholder only needs to show that a loss occurred. The burden then shifts to the insurer to prove that a specific exclusion applies. This is a significant advantage for the policyholder. For a more detailed explanation, see our guide to policy interpretation.

With a named peril policy (such as an HO-1 or a DP-1 — the form commonly issued by basic state programs like the California FAIR Plan), the policyholder must prove that the loss was caused by one of the specific perils listed in the policy. The burden of proving coverage rests with you from the start. DP-2 (Broad Form) is also named-peril, but with a longer list of covered perils than DP-1. The DP-3 (Special Form) is different: it provides open-peril coverage for the dwelling and other structures (with personal property still on a named-peril basis, much like the HO-3 structure). If you are unsure which form you have, check your declarations page — the policy form number tells you whether your coverage is open peril or named peril.

Concurrent Causation in California

When a loss results from a combination of covered and excluded perils, California applies the efficient proximate cause doctrine. Under this rule, the question is which peril was the predominant cause — the one that set the chain of events in motion. If the predominant cause is a covered peril, the entire loss is covered, even if an excluded peril also contributed. If the predominant cause is an excluded peril, the loss is excluded. This doctrine is codified at Insurance Code § 530 and has been California Supreme Court law since Garvey v. State Farm (1989) 48 Cal.3d 395. The covered peril must be the predominant cause, not merely a contributing factor.

Insurers have responded to this rule by adding “anti-concurrent causation” (ACC) clauses to many policies. These clauses purport to exclude any loss to which an excluded peril contributed “in any sequence,” regardless of whether the covered peril was the predominant cause. In California, ACC clauses are unenforceable to the extent they conflict with the efficient proximate cause doctrine. The Court of Appeal applied this directly to ACC language in Howell v. State Farm Fire & Cas. Co. (1990) 218 Cal.App.3d 1446. The California Supreme Court restated the general rule in Julian v. Hartford Underwriters (2005) 35 Cal.4th 747 (although on Julian’s facts the Court enforced the carrier’s exclusion as targeting a distinct peril). In 2018 the Legislature enacted Insurance Code Section 530.5 (effective Jan. 1, 2019) addressing concurrent-peril claims where one of the perils is a landslide, mudslide, mudflow, or debris flow — the statute’s practical effect is to protect post-wildfire mudslide and debris-flow claims, among others. However, insurers continue to include ACC clauses in policies and invoke them in claim denials, so policyholders should be aware of the ongoing tension between what policies say and what California law allows. If your denial involves mixed causes, this is an area where professional guidance is essential.

How to Respond to a Denial Letter

If your claim is denied, take these steps:

• Get the denial in writing. If you received a verbal denial, request a written denial letter that cites the specific policy provisions the insurer is relying on.
• Read your actual policy. Do not rely on what the adjuster tells you the policy says. Read the exclusion or condition yourself, word by word.
• Respond in writing.Submit a written rebuttal that addresses each point in the denial. Include supporting documentation — photos, expert reports, contractor assessments, or any evidence that contradicts the insurer’s position.
• Preserve all evidence. Do not make permanent repairs or dispose of damaged materials before the dispute is resolved, as the insurer may need to re-inspect.

When to Escalate

If your written response does not result in the denial being overturned, you have several escalation options:

• File a complaint with the California Department of Insurance (CDI). The CDI can review your claim handling and determine if the insurer violated the Fair Claims Settlement Practices Regulations.
• Invoke appraisal. If the dispute is about the amount of loss (not coverage itself), appraisal may be available under your policy.
• Consult an attorney. Coverage disputes that involve policy interpretation, bad faith, or significant dollar amounts may require legal representation. An insurance coverage attorney can evaluate the strength of your position and advise on next steps.

A licensed Public Adjuster can also help you navigate coverage disputes by reviewing your policy language, preparing a detailed written response, and managing communications with the insurer on your behalf.

This article is for informational purposes only and does not constitute legal advice. Insurance policies and applicable law vary by state and by policy form. Consult with a licensed professional regarding your specific situation.

Written by Leland Coontz III, Licensed Public Adjuster, CA License #2B53445.