Your Insurance Claim Was Denied. Here’s Exactly What to Do Next. (2026)

Your Insurance Claim Was Denied. Here’s Exactly What to Do Next. (2026)

Why the Clock Starts the Moment You Open That Letter

The envelope looks like every other piece of insurance mail you’ve ever ignored. Then you read the first line: “We regret to inform you that your claim for [service] has been denied.” Your chest tightens. Your eyes skip ahead, scanning for a reason, a number, something that makes sense. You find a paragraph of dense language citing policy exclusions or medical necessity criteria you’ve never heard of. And then the question lands: now what?

A denied claim is not a final verdict. It is a preliminary decision, and insurers count on the fact that most people treat it as the last word. The majority of policyholders who had legitimate, winnable appeals never filed them, not because their cases were weak, but because they froze, or they vented to a friend for three weeks, or they called the insurer’s general customer service line and got nowhere. By the time they looked up the appeals process, the window had narrowed or closed entirely.

Consider someone on an employer plan who receives a denial in early March. They set the letter aside, assuming they have plenty of time. Three weeks later, they call a patient advocate who asks for the plan document. Buried on page forty, the insurer has set an internal appeal deadline of 60 days. That’s already a third of the window gone, with no medical records requested, no appeal letter drafted, and no supporting documentation from a physician. Plans governed by ERISA (most employer-sponsored coverage) allow up to 180 days for internal appeals by default, but individual plan documents can impose shorter deadlines. ACA-compliant individual and small group plans must allow at least 180 days. Medicare Advantage and Medicaid operate on entirely separate appeal tracks with their own, often tighter, timelines.

Before you call anyone, before you search for anything else, do this: find the denial letter and locate the section that states the specific reason your claim was denied and your appeal rights. Insurers must include both by law. That language is your map. It tells you what standard they applied, what evidence they reviewed, and how long you have to respond. Everything that follows in this process depends on what those paragraphs say. Read them twice. Then read them a third time with a pen in your hand, because the next 72 hours matter more than the next 72 days.

Before You Do Anything: Identify Which of the Four Denial Types You’re Dealing With

The right move depends entirely on why they denied you.

Most people react to a denial letter with a single instinct: appeal. But filing a generic appeal without understanding the specific type of denial is like treating a broken bone and a bacterial infection with the same pill. Your Explanation of Benefits (EOB) contains a denial reason code, and insurers must provide it. Find that code. It tells you which of the following four categories you’re dealing with, and each one demands a fundamentally different response.

1. Administrative or Technical Denial

This is the most common denial type, and the most commonly overturned. Administrative denials happen because of procedural errors: a wrong billing code, a missing pre-authorization, an out-of-network provider billed incorrectly, or a simple data entry mistake like a transposed policy number. The insurer isn’t saying your treatment was unnecessary or uncovered. They’re saying the paperwork didn’t check out. In many cases, a corrected claim resubmission resolves the issue without a formal appeal at all. Call your provider’s billing department first. Ask them to review the codes submitted and compare them against the denial reason. This is often a phone call and a resubmission, not a legal battle.

2. Medical Necessity Denial

This is the denial that stings the most, because the insurer is essentially overruling your doctor. A medical necessity denial means the insurance company’s review team has determined that the treatment, procedure, or medication was not clinically required for your condition. Overturning this requires a clinical appeal: your physician needs to submit detailed documentation supporting the medical rationale, including a Letter of Medical Necessity that explains why the treatment was appropriate for your specific diagnosis and circumstances. You should also request a peer-to-peer review, which allows your treating physician to speak directly with the insurer’s medical reviewer. These conversations frequently shift outcomes, because a reviewer reading a chart summary and a physician explaining a patient’s full clinical picture are working with very different levels of information.

3. Coverage Exclusion Denial

Here, the insurer isn’t questioning whether the treatment was necessary. They’re arguing that your policy simply doesn’t cover it. This sounds final, but it often isn’t. Coverage exclusions are sometimes applied incorrectly, especially in ambiguous situations where a procedure straddles two billing categories or where policy language is vague about what falls inside or outside coverage. Your response here starts with a careful, word-by-word review of your actual policy document, not the summary of benefits, but the full contract. Look for the specific exclusion they cited. Compare it against the exact service that was rendered. If there’s any gap between what the exclusion says and what actually happened, that gap is your appeal.

4. Untimely Filing Denial

This denial means the claim was submitted after the insurer’s filing deadline, which varies by plan but is typically 90 days to one year from the date of service. On the surface, this feels like a dead end. But untimely filing denials can sometimes be challenged if the delay resulted from insurer or provider error rather than your own inaction. If your provider failed to submit the claim on time, or if the insurer gave you incorrect information that caused the delay, or if you were never notified of a prior denial that triggered a secondary filing window, you may have grounds to dispute it. Document the timeline meticulously. Pull call logs, saved emails, and any written correspondence that shows the delay wasn’t your fault.

Misidentifying your denial type is the single most expensive mistake people make in this process. An administrative error treated like a coverage exclusion wastes weeks. A medical necessity denial met with a simple resubmission goes nowhere. Get the category right first. Everything else follows from that.

The Numbered Appeal Workflow: What to Do, In Order, Starting Today

Now that you know what kind of denial you’re fighting, here is the exact sequence of moves. Each step builds on the one before it. Skip a step and you weaken every step that follows. Work them in order, starting the same day you read this.

Step 1: Read the denial letter in full and locate the reason code and appeal deadline. Most people skim denial letters, catch the word “denied,” and stop reading. That is a mistake. The letter contains a specific reason code or explanation code, a citation to the policy provision the insurer relied on, and a deadline for filing your appeal. That deadline is non-negotiable. Write it down. Put it in your calendar with a reminder two weeks before it expires. If the letter is vague or missing any of these elements, that itself becomes a point you raise in your appeal.

Step 2: Pull your full policy document and find the relevant coverage section. Your Summary of Benefits is not your policy. You need the complete plan document, sometimes called the Evidence of Coverage or Certificate of Insurance. If you have employer coverage, your HR department can provide it. If you purchased through the marketplace, it is available through your insurer’s portal. Search the document for the specific procedure code, diagnosis, or service type that was denied. Read the exclusions section and the medical necessity definitions word for word. You are looking for the gap between what the insurer claims and what the policy actually says.

Step 3: Call the insurer’s member services line and request the specific clinical guidelines used to deny your claim. This is the step most guides omit, and it changes everything. Insurers must provide the clinical criteria or medical policy bulletins they relied on to make their decision. Ask for them by name. If the representative cannot provide them on the call, request them in writing and note the date, time, and name of the person you spoke with. This information is essential for building a medical necessity appeal because it tells you exactly what standard your documentation must meet.

Step 4: Contact your provider’s billing department and ask about refiling or a peer-to-peer review. Before you write a single word of your appeal, call the office that treated you. If the denial was administrative, their billing team may be able to refile the claim with corrected codes and resolve the issue without a formal appeal. If the denial was based on medical necessity, ask your treating physician to request a peer-to-peer review. This process allows your doctor to speak directly with the insurer’s medical reviewer, physician to physician, and it overturns a significant percentage of medical necessity denials before a formal appeal is ever filed. Your doctor knows your case. Let them make that argument in real time.

Step 5: Gather your documentation package. Assemble every piece of evidence that supports your claim. This includes medical records, physician notes, lab results, imaging reports, prior authorization approvals, referral letters, and any correspondence with the insurer. If your physician is willing to write a letter of medical necessity explaining why the treatment was appropriate and required, that letter becomes the centerpiece of your appeal. Also include any peer-reviewed clinical literature or professional society guidelines that support the treatment you received. (The full documentation checklist appears at the end of this article.)

Step 6: Write and submit your formal internal appeal letter. Your appeal letter should be factual, organized, and free of emotional language. Open with your name, policy number, claim number, and the date of the denial. State clearly that you are filing a formal internal appeal. Reference the specific policy language that supports coverage. Cite the clinical guidelines the insurer used (from Step 3) and explain, with supporting documentation, why your case meets those criteria. Attach everything from Step 5. Keep sentences short. Let the evidence do the persuading.

Step 7: Confirm receipt and track your appeal in writing. Send your appeal via certified mail with return receipt requested, or submit it through the insurer’s documented online portal where submissions are timestamped. Phone calls alone create no paper trail, and a paper trail is your only protection if the insurer claims they never received your filing. Under the Affordable Care Act, insurers must acknowledge your appeal within 5 business days and resolve internal appeals within 30 to 60 days depending on the type. If you do not receive acknowledgment within that window, call, document the call, and follow up in writing immediately.

That is seven steps. None of them require a lawyer. All of them require precision and follow-through. Complete them in sequence and you will have built the strongest possible case before the insurer’s review team ever opens your file. Once you’ve submitted, the next question is where to escalate if the internal appeal fails, and that depends on which state you’re in.

State Appeal Deadlines and External Review Rights: The Reference Table

Before you file that appeal letter, confirm your exact deadline, because it varies by state and plan type. Miss it by a single day and your insurer can refuse to consider your appeal entirely, regardless of how strong your evidence is.

First, understand the two tracks. Every denied claim triggers a right to an internal appeal, where the insurer’s own review team reconsiders the decision. If the internal appeal fails (or in urgent cases), you can escalate to an external review, where an accredited Independent Review Organization (IRO) evaluates your case with no financial ties to the insurer. Under the Affordable Care Act, most individual and small group plans must provide access to external review through these IROs. The IRO’s decision binds the insurer. External review overturns insurer denials in a meaningful percentage of cases, which tells you something about how many initial denials lack solid footing.

Some states go further than the federal baseline. California, New York, and Illinois have built stronger external review protections with broader eligibility criteria and faster timelines. The table below reflects each state’s framework. One critical note before you scroll: filing a complaint with your state insurance department is a separate, parallel action you can take alongside your appeal. Complaint filings often accelerate insurer response times because regulators track complaint volume by company.

Note: “Federal process” indicates the state defers to the federal external review mechanism administered through HHS. “State process” indicates the state operates its own accredited external review program. “State, expanded” indicates the state provides broader eligibility or faster timelines than the federal baseline. ERISA-governed employer plans follow federal external review rules regardless of state. Medicare Advantage and Medicaid follow separate federal and state tracks not reflected above. Always verify current deadlines directly with your state insurance department, as rules can change.

With your deadline confirmed and your escalation options mapped, the next question is which of those options to use, and when to use more than one at once.

Internal Appeal, External Review, or State Complaint: A Decision Framework

By now you may be wondering whether to appeal, file for external review, or complain to your state regulator. The answer, in many cases, is all three. These are not mutually exclusive tracks. They run in parallel, and choosing the right combination at the right time is what separates people who get results from people who spin their wheels.

Knowing when to escalate is one thing. Knowing when to hand the process off entirely is another, and that threshold is worth understanding before you’re deep in the middle of a complex dispute.

When to Stop DIY-ing This and Get Professional Help

Most straightforward claim denials can be resolved through the process above. A missing code, a paperwork gap, a misapplied policy term: these are fixable with persistence and documentation. But some situations call for professional backup, and recognizing that threshold early saves you time and money. Here are four signals that you’ve crossed it.

Signal 1: The dollar amount exceeds $5,000 to $10,000. Below that range, the economics of hiring a professional rarely make sense. Above it, they almost always do. For property and casualty claims (homeowners, auto, commercial), a public adjuster is the right call. Public adjusters work exclusively on your behalf to assess damage, prepare estimates, and negotiate settlements with your insurer. They typically charge a percentage of the payout, so their incentive aligns with yours. Note: public adjusters handle property and casualty only, not health insurance. That distinction matters.

Signal 2: The insurer has missed or ignored procedural timelines. Every state sets deadlines for how quickly an insurer must acknowledge, investigate, and respond to claims. If your insurer blows past those deadlines without explanation, that’s not just sloppy administration. It may constitute a violation of unfair claims settlement practices. An insurance attorney can evaluate whether the insurer’s conduct rises to the level of bad faith, which is a distinct legal cause of action that may entitle you to damages beyond the original claim amount.

Signal 3: The denial involves a serious ongoing medical condition where delay has health consequences. If you’re fighting a denial while actively needing treatment, a patient advocate can manage the appeals process while you focus on your health. Some patient advocates work on contingency for large claims, meaning no upfront fees. They know the clinical language, the insurer’s internal review structure, and how to escalate effectively.

Signal 4: Your plan is governed by ERISA and external review has failed. The Employee Retirement Income Security Act covers most employer-sponsored plans, and litigation under ERISA follows rules that differ sharply from standard insurance disputes. A general personal injury attorney is the wrong choice here. You need a lawyer who specifically practices ERISA benefits law. This is a narrow specialty, and the procedural requirements are unforgiving. Courts typically limit their review to the administrative record built during your appeals, which is exactly why the documentation habits described throughout this article matter so much.

Asking for help isn’t admitting defeat. It’s recognizing that the system was designed to be complex, and sometimes the smartest move is matching that complexity with someone who already knows the terrain. Before you make that call, make sure your documentation package is complete, because every professional you bring in will ask for it first.

The Documentation Package That Wins Appeals (Most People Submit Half of This)

Before you send that appeal, make sure you have everything on this list. A weak documentation package is the most common reason strong appeals fail. Most people submit a letter and a few medical records, then wonder why the denial stands. What follows is the complete inventory, organized into three categories.

A. Documents From the Insurer

The denial letter (Explanation of Benefits). This is your roadmap. It contains the specific reason code and policy language the insurer relied on. Every argument in your appeal should respond directly to what’s stated here.

The clinical criteria used to evaluate your claim. Insurers apply internal medical policies or criteria sets (often from organizations like MCG or InterQual) to determine medical necessity. Ask for the exact criteria applied to your case.

Your complete claim file. Under ERISA, you have a legal right to request this for employer-sponsored plans. State law typically grants similar rights for individual and marketplace plans. Request it in writing. The file may contain internal notes, reviewer comments, or communications you’ve never seen.

B. Documents From Your Provider

Complete medical records related to the claim. Not a summary. The full chart notes, imaging reports, lab results, and treatment history that establish the clinical picture.

A Letter of Medical Necessity from your treating physician. This is one of the most powerful documents in a health insurance appeal. It should be written by the physician, not by you, and it should reference specific diagnostic criteria, failed alternative treatments, and the clinical rationale for the recommended course of care. A vague letter changes almost nothing. A precise one can reverse a denial on its own.

Peer-reviewed clinical studies. If your treatment is supported by published medical literature, attach the relevant studies. Independent Review Organization reviewers are physicians themselves, and they give significant weight to evidence from respected journals. Your doctor’s office or a medical librarian can help you locate the right publications.

C. Documents You Create or Gather Yourself

Your appeal letter. Clear, factual, organized by the specific denial reasons. No emotional pleas without supporting evidence.

A timeline of events. Dates of treatment, dates of claim submission, dates of each insurer communication. This creates a narrative that reviewers can follow quickly.

Copies of all prior correspondence. Every letter, email, and fax you’ve sent or received. Include your communication log: date, time, name of the representative you spoke with, and what was said. This log becomes critical if the claim escalates to a regulatory complaint or litigation.

Your policy documents. The Summary of Benefits and Coverage, the full plan document, and any rider or amendment relevant to the denied service. Highlight the sections that support coverage.

Assemble everything before you submit. A complete package signals to the reviewer that this appeal was prepared seriously, and it eliminates the delays that come from piecemeal submissions.

Frequently Asked Questions