You did everything you were supposed to. You called the insurance company ahead of time. You waited on hold for 45 minutes. You confirmed that the procedure, medication, or home health service would be covered. You documented the call. And then the denial letter arrived anyway.
If you've been a family caregiver for any length of time, there's a good chance this story is familiar. Insurance denials are one of the most common — and most exhausting — obstacles caregivers face. And there's something important that most caregivers don't realize until they've already given up: the denial is not necessarily the end of the road.
This guide gives you the step-by-step process to appeal a denied insurance claim, including templates you can copy, Medicare-specific procedures, deadlines you can't miss, and the mindset that actually wins appeals. The system is designed to be confusing. This guide is designed to cut through it.
82%
of prior authorization denials are overturned when patients or caregivers appeal. Most people accept the denial and never fight back — which is exactly what insurers are counting on.
The System Is Designed to Exhaust You
Before we get into the process, let's name what's actually happening. Insurance denials — especially prior authorization denials — are not always based on a careful review of your loved one's medical needs. They're often automated, applied broadly, and issued with the reasonable expectation that most people won't push back.
Medicare Advantage plans alone denied approximately 4.1 million prior authorization requests out of 50 million in a single year. Of those, only a fraction are ever appealed. Insurers know this.
"It's overwhelming by design. Because insurers know confusion and fatigue cause people to give up. That's exactly what they want you to do."
— Caregiver, r/CaregiverSupport
That's not cynicism — it's an accurate description of how insurance companies manage their claims costs. Long hold times, transferred calls, vague denial reasons, multiple departments, and tight deadlines all serve the same function: making the process taxing enough that people give up before the finish line.
Understanding this doesn't make the appeals process easier, but it does reframe the task. You're not being rejected because the care isn't valid or necessary. You're being processed through a system built on attrition. Persistence is the most powerful tool you have.
Understanding Why Your Claim Was Denied
The first step in any appeal is understanding what you're appealing. Denials come in several forms, and each requires a different approach:
Prior Authorization Denial
The most common type. The insurer refused to pre-approve a service, procedure, medication, or equipment before it was provided. Common reasons include: not medically necessary, experimental/investigational, requires step therapy (try cheaper option first), or the provider didn't submit adequate documentation. This is the category with the highest appeal success rates.
Coverage Denial (Service Not Covered)
The insurer says the service isn't covered by the plan at all. Sometimes this is accurate — but sometimes the insurer is misapplying plan language, miscoding the claim, or using outdated information. Always verify with your policy's Evidence of Coverage document before accepting this as final.
Medical Necessity Denial
The insurer acknowledges the service is covered in general, but claims it wasn't medically necessary in this specific case. These denials are often automated — using AI or algorithms to compare claims against clinical guidelines — without a physician actually reviewing the individual case. A physician review request as part of your appeal can be powerful here.
Administrative or Coding Denial
Sometimes the denial is simply an error — wrong billing code, missing information, out-of-network provider issue, or paperwork submitted to the wrong department. These are often the easiest to resolve and sometimes don't require a formal appeal — just a corrected resubmission.
The denial letter must tell you the specific reason. Read it carefully. The reason dictates your strategy.
The 7-Step Appeal Process
Here's the process, in order. Don't skip steps.
Read the denial letter — all of it
Most people skim the denial letter and stop at "denied." Read the whole thing. Look for:
- The specific denial code and the reason in plain language
- The exact deadline to file an appeal (this is often 30–180 days — do not miss it)
- Whether you have the right to an external review if the internal appeal fails
- The specific documentation the insurer says was missing or insufficient
- Contact information for the appeals department (it's different from regular customer service)
Keep this letter. You'll need it for every subsequent step.
Call the insurance company to understand the denial
Before writing anything, call the appeals line and ask for a full explanation of the denial. Ask specifically: "Can you tell me exactly what documentation was missing or what criteria wasn't met?" Document everything — date, time, representative name, and everything they say.
Sometimes this call alone resolves the issue. You may learn that a simple resubmission with a corrected code or additional documentation will fix it without a formal appeal. Don't skip this step — it saves time and sometimes makes the appeal itself unnecessary.
Gather every piece of relevant documentation
Your appeal is only as strong as your documentation. Collect:
- The original claim and the denial letter
- Your insurance policy's Evidence of Coverage document (not just the Summary of Benefits)
- Medical records relevant to the denied service — doctor notes, test results, diagnosis documentation
- Any prior authorization forms that were submitted and approved (if applicable)
- Clinical guidelines or medical literature that supports the medical necessity of the service
- A written record of any conversations with the insurance company (include dates and rep names)
More is better. The reviewer will have everything in front of them. Give them reasons to approve, not reasons to doubt.
Get a supporting letter from the treating physician
This is the single highest-impact thing you can do in most appeals. Ask your loved one's physician (or specialist) to write a letter directly addressing the denial reason. The letter should:
- State the diagnosis, treatment plan, and why the specific service is medically necessary
- Explain why alternatives (such as step-therapy options the insurer suggested) are not appropriate in this case
- Reference clinical guidelines or literature if applicable
- Be addressed specifically to the insurer's appeals department
Insurers can second-guess their own algorithms. It's much harder to override a treating physician's documented clinical judgment. Most doctors are willing to write this letter when asked — many have done it many times before.
Write your appeal letter
Your appeal letter should be professional, factual, and direct. Address the specific denial reason. Don't write an emotional narrative — write a logical argument for why the denial was wrong. See the template below as a starting point. Key elements:
- Patient name, member ID, claim number, date of service — all in the header
- One-sentence summary of what was denied and why
- Your argument for why the denial was incorrect, with specific references to your policy language
- A list of all enclosures
- Request for specific action: "I request that this denial be reversed and the claim be approved"
Submit your appeal — and keep proof
Send everything to the address specified in the denial letter for appeals. Do not send it to general customer service. Key submission tips:
- Send by certified mail with return receipt requested — this creates a legal paper trail
- Keep a complete copy of everything you submit
- If submitting through an online portal, take screenshots confirming submission
- Note the exact date submitted — this matters for deadlines
Call 7–10 days later to confirm the insurer received your appeal. Get a reference number and the name of the reviewer assigned to your case.
Escalate if the internal appeal fails
If your internal appeal is denied, you are not done. Federal law (ACA) requires that most health plans offer an external review by an independent organization. This is separate from the insurance company and is your most powerful escalation option. Steps:
- Request external review immediately after the internal denial — there are deadlines
- An independent review organization (IRO) will review your case without influence from the insurer
- External reviews are binding — the insurer must comply with the decision
- For Medicare denials, the external review process goes through the OMHA (Office of Medicare Hearings and Appeals) after the first two levels of appeal
External review success rates are significant. Don't stop at the first denial of your appeal.
Appeal Letter Template
Use this as your starting framework. Customize every bracketed section with your specifics.
Insurance Claim Appeal Letter Template
[Your Full Name]
[Your Address]
[Date]
[Insurance Company Name]
Appeals Department
[Insurance Company Address]
RE: Formal Appeal of Claim Denial
Claimant: [Patient Full Name]
Member ID: [ID from insurance card]
Claim Number: [From denial letter]
Date of Service: [Date]
Denial Date: [Date on denial letter]
Dear Appeals Reviewer,
I am writing to formally appeal the denial of the above-referenced claim. The denial states: [COPY THE EXACT DENIAL REASON FROM THE LETTER]. I respectfully request that this determination be reversed.
[PARAGRAPH 1: Explain the medical context. Who is the patient? What is their diagnosis? What was the denied service and why was it ordered?]
[PARAGRAPH 2: Address the specific denial reason directly. If denied as "not medically necessary," explain why it is. If denied as "experimental," cite accepted clinical guidelines. Reference your policy's coverage language if applicable.]
[PARAGRAPH 3: Note any additional supporting evidence. "Enclosed please find a letter from [Dr. Name], [Patient]'s treating physician, confirming the medical necessity of this service."]
Enclosed: [List everything: denial letter, medical records, physician letter, relevant policy sections, etc.]
I request a full review of this claim and ask that you contact me at [phone / email] with any questions.
Sincerely,
[Your Name]
[Relationship to Patient]
Tip: Send by certified mail and keep a copy of everything. Call after 7 business days to confirm receipt.
Medicare-Specific Appeal Rights
If your loved one is on Medicare (Original Medicare or Medicare Advantage), there is a structured, multi-level appeal process that gives you significant rights. Understanding these levels matters — each level has a different decision-maker and a different deadline.
The most important thing to know: don't stop at Level 1. The success rate increases significantly as you move through the levels, because each level involves a more independent reviewer with less incentive to uphold the original denial.
For urgent care denials: If the denial involves care that is urgent or ongoing, request an expedited review. Medicare and most private insurers are required to respond within 72 hours for expedited reviews. Call the insurance company and explicitly use the word "expedited" — it triggers a different process.
What Works — And What Doesn't
After reviewing hundreds of caregiver experiences with insurance appeals, some patterns emerge:
What consistently works
- Physician support letters — The most effective single addition to any appeal
- Directly quoting your policy language — Show specifically where the insurer's denial contradicts their own coverage terms
- Citing clinical guidelines — Professional medical societies publish standards of care; reference them when relevant
- Being specific and factual — Every claim should be supported by documentation you're enclosing
- Persistence — Filing multiple levels of appeal rather than stopping after one denial
What undermines appeals
- Emotional framing without facts — Appeal reviewers need reasons to approve, not descriptions of how the denial made you feel
- Vague arguments — "This care is needed" is not an argument. "This care meets criteria X per your plan's coverage terms and clinical guideline Y" is an argument.
- Missing deadlines — Once a deadline passes, you often lose the right to appeal that denial
- Sending to the wrong department — Customer service and the appeals department are different; only the appeals department can reverse a denial
When to Get Help
If the claim is significant, or if you've already tried and been denied at multiple levels, getting professional help is worth it. Options include:
- Hospital patient advocates — Most hospitals have patient advocates on staff who help navigate insurance denials, often at no cost
- State Health Insurance Assistance Programs (SHIP) — Free Medicare counseling and appeals support in every state. Find yours at shiphelp.org
- Patient advocacy services — Independent patient advocates (like those at Solace Health) specialize in insurance appeals; many work on contingency
- Elder law attorneys — For Medicare or Medicaid denials involving significant care needs or nursing facility decisions
- State Insurance Department — If you believe the insurer is acting in bad faith or violating state insurance law, file a complaint with your state insurance department — it's free and often gets results
You are not required to navigate this alone. And asking for help isn't giving up — it's being strategic about a system designed to outmaneuver people who don't know all the rules.
The Bottom Line
Insurance denials feel personal. They feel like someone looked at your loved one's situation and decided it wasn't worth covering. But in most cases, denials are procedural — the result of automated systems and high-volume processing, not a careful review of your situation.
When you appeal, you are triggering an actual human review. You are forcing a real person to look at your loved one's case with the documentation you've assembled. That changes the calculation significantly — which is exactly why 82% of prior authorization denials get overturned when people push back.
The system doesn't want you to know your odds are that good. Now you do. Start with Step 1. Read the letter. Keep going from there.