Yes, you can. The more useful question is how the appeal process actually works, what makes an appeal succeed rather than fail, and how far beyond the insurer’s own internal process you can take the challenge if their first answer does not change. Most people who receive a denial letter do not know that multiple layers of review exist, each with different mechanisms and different leverage, and that the insurer’s internal appeals process is only the first of them. Understanding the full architecture of what is available to you changes how you approach a denial from the outset.

The internal appeal is where the process begins, and it is worth taking seriously rather than treating as a formality. Most insurers maintain a formal internal review process through which a claimant can contest a denial, and this process typically involves submitting a written appeal along with any additional evidence or documentation that addresses the stated basis for the denial. The outcome of an internal appeal depends almost entirely on whether the appeal provides the insurer’s reviewing personnel with something new to work with. An appeal that simply restates the facts of the original claim and asks the insurer to reconsider produces the same outcome as the original decision most of the time, because the reviewer has no new information to reason from. An appeal that identifies a specific error in the insurer’s analysis, introduces medical records or expert opinions that were not part of the original submission, or makes a legal argument about how the policy language should be interpreted gives the reviewer a genuine basis to reach a different conclusion.

The single most important step before filing an internal appeal is to obtain and review the complete claims file. You have the right in most states to request the documentation the insurer relied upon in making the denial decision, including the adjuster’s notes, any medical reviews or IME reports, the investigation report, and the coverage analysis. This material is the foundation of the insurer’s decision, and reading it often reveals exactly where the analysis went wrong. An adjuster who mischaracterized your medical records, a medical consultant who reviewed records selectively, a coverage analyst who applied an exclusion to facts that do not actually fall within its scope, these errors are invisible until you see the file, and once visible they become the specific targets of an effective appeal. Insurers are not infallible, and their claims files sometimes contain mistakes that are straightforward to identify and document once you are looking at them directly.

The nature of the denial determines what additional evidence matters most in an appeal. If the denial was based on disputed liability, meaning the insurer concluded their policyholder was not at fault or that you bore a share of the fault they are not willing to pay for, the appeal needs to address the liability determination with evidence that the insurer’s investigation did not account for. Accident reconstruction analysis, additional witness statements, surveillance footage, event data recorder information, or an expert analysis of the vehicle damage patterns can all constitute new information that the reviewer did not have when the denial was issued. If the denial was based on the insurer’s conclusion that your injuries were pre-existing, the appeal needs to address causation directly, typically through a detailed opinion letter from your treating physician that documents your pre-accident baseline, identifies the specific changes produced by the accident, and explains why the treating physician’s clinical assessment supports a causal connection between the accident and your current condition. A generic letter from your doctor saying you were injured in a car accident does not accomplish this. A letter that engages specifically with the insurer’s pre-existing condition argument and responds to it with clinical detail does.

If the denial was based on a coverage ground, the appeal is fundamentally a legal argument rather than a factual one, and it requires engaging with the specific policy language the insurer cited. Policy interpretation disputes are decided by courts under rules that favor the insured in ways the insurer’s denial letter does not acknowledge. Exclusionary language is construed narrowly. Ambiguities in policy language are resolved against the insurer who drafted the document. Coverage provisions are construed broadly to effectuate the reasonable expectations of the insured. An insurer who applied an exclusion broadly, who relied on ambiguous language to deny coverage, or who failed to read the exclusion in light of exceptions that apply to your circumstances has a legally vulnerable denial, and identifying that vulnerability in the appeal letter is work that an attorney does effectively and that most claimants cannot do well on their own. Coverage disputes are among the most technical areas of insurance law, and the internal appeal on a coverage denial is frequently the point at which legal representation makes the largest practical difference.

The timeline for completing an internal appeal matters and varies by insurer and state. Most states require insurers to acknowledge receipt of an appeal within a specific number of days and to issue a decision within a defined period, typically thirty to sixty days depending on the jurisdiction and the nature of the claim. Missouri’s insurance regulations impose prompt response requirements on appeal decisions just as they do on initial claim decisions, and an insurer that sits on an appeal without responding within the required period has created an independent basis for a regulatory complaint alongside the underlying denial. Tracking these timelines from the moment you submit the appeal, and following up in writing when they are not being met, is part of building the documented record that supports every escalation option available to you if the appeal fails.

When an internal appeal is denied, or when the insurer fails to respond to the appeal within the required period, the next option is a regulatory complaint to the state insurance department. In Missouri that is the Department of Insurance, Financial Institutions and Professional Registration. A regulatory complaint requires the insurer to formally justify the denial to a government body with investigative and enforcement authority. The complaint process does not directly reverse a denial or award compensation, but it triggers formal scrutiny of the insurer’s conduct and frequently produces movement on claims that had previously been unresponsive to every other form of pressure. Insurers subject to regulatory review of a specific denial have an incentive to resolve it that is qualitatively different from the incentive created by a claimant’s repeated phone calls, and the record created by the regulatory complaint is useful in subsequent litigation if the claim eventually goes that far.

Appraisal is a mechanism that applies specifically to property damage disputes and that is written into most auto insurance policies without most claimants ever reading the provision. If you disagree with the insurer’s assessment of the value of property damage, vehicle damage being the most common example, the appraisal process allows each party to hire an independent appraiser and submit the dispute to an umpire for resolution. The umpire’s decision is binding. The appraisal process is faster than litigation, less expensive, and specifically designed for disputes about valuation rather than coverage or liability. If you received a settlement offer for vehicle damage that you believe substantially undervalues your vehicle or the cost of repairs, and the insurer has been unwilling to increase the offer through negotiation, invoking the appraisal clause in your policy is a formal mechanism for resolving that dispute without filing suit. Many claimants do not know the clause exists until someone tells them to look for it.

Mediation is an option in some states and under some policies for disputes that go beyond property valuation to include bodily injury claims. Some states have established informal dispute resolution programs through their insurance regulatory offices that provide mediation of certain types of insurance disputes at no or low cost to the claimant. These programs are underused because they are not well advertised, but for claims in the range where litigation feels disproportionate to the amount at issue, a mediated resolution facilitated by a regulatory office can produce an outcome that neither party could reach through direct negotiation. Whether mediation is available in your specific situation depends on the type of claim, the amount at issue, and the state’s specific program offerings.

Litigation is the option that the insurer’s entire claims process is designed to make you believe is too difficult, too expensive, and too uncertain to be worth pursuing. That perception is accurate for some claims and inaccurate for others, and the insurer benefits from claimants not being able to distinguish between the two. Personal injury attorneys who handle insurance denial cases typically do so on contingency, meaning they collect a fee only if they recover compensation for you, which removes the financial barrier that the insurer is counting on. An attorney evaluating a denied claim is assessing the likelihood of success, the value of the underlying claim, and the costs of pursuing it, and that evaluation is something the insurer has already done on their own side of the table. The insurer knows whether their denial is legally defensible. Their decision about whether to maintain it in the face of credible litigation reflects that assessment. A denial that the insurer’s own coverage counsel believes is legally vulnerable does not survive the filing of a well-framed lawsuit the way it survives an unrepresented claimant’s phone calls.

Bad faith litigation sits alongside or beneath the underlying coverage or liability dispute as a separate cause of action that can significantly exceed the value of the original claim. An insurer who denied a legitimate claim without a reasonable basis, who conducted a sham investigation before issuing the denial, or who applied an exclusion they knew did not apply to the circumstances of the claim has not merely made a contract decision you can contest. They have committed conduct that is independently actionable and that carries exposure for consequential damages, attorney fees, and in egregious cases punitive damages. The availability of bad faith as a theory of recovery changes the economics of litigation in a way that affects how the insurer evaluates the risk of maintaining a denial that cannot be defended. It is not a theory that applies to every denied claim, but in cases where the denial was clearly unreasonable or where the investigation was clearly inadequate, it is one that attorneys experienced in insurance law evaluate as a matter of course.

The statute of limitations runs through all of this. In Missouri the general personal injury statute of limitations is five years, but specific policy provisions can impose contractual limitation periods that are shorter, and those shorter periods are enforceable. A claimant who spends two years pursuing an internal appeal and a regulatory complaint before consulting an attorney may discover that the contractual window for filing suit has passed, even if the statutory window is still open. This is not a hypothetical scenario. It is a pattern that insurers sometimes exploit by extending the internal review process long enough to affect the claimant’s litigation options. Every escalation step should be taken with awareness of the relevant deadlines, and consulting an attorney early in the process is the only way to ensure you know what those deadlines are before one of them has passed.

An appeal is not a long shot. It is a formal process with defined steps, defined leverage points, and a track record of producing outcomes different from the original denial when the appeal is built around the specific vulnerability in the insurer’s decision rather than around general disagreement with the result. The question is not whether to appeal. The question is how to build the appeal that has the best chance of succeeding, and whether to do that with legal help or without it.

This article is for general informational purposes and does not constitute legal advice. The appeals process for insurance denials varies by state, policy type, and the basis for the denial. If your claim has been denied, consult a licensed attorney in your jurisdiction to understand your options and the deadlines that apply to them.