What Happens After You Appeal an Insurance Denial?

You did it. You filed your appeal. The letter is sent, the documents are attached, the certified mail receipt is in your files. Now what?

For many patients, this is a period of anxious waiting — and a lot of uncertainty about what's actually happening on the other side. Understanding the process will help you stay in control and know exactly when to act.

Here's what happens after you file an insurance appeal.

Step 1: The Insurer Acknowledges Receipt

Most insurance companies will send you a written acknowledgment that your appeal was received. This may arrive by mail or appear in your online account portal.

Action: Confirm receipt. If you don't receive an acknowledgment within 5–7 business days and you don't have online portal confirmation, call member services and ask them to confirm your appeal is in their system. Get a reference number.

Keep a log of every communication: date, method, person spoken to, what was said.

Step 2: Your Appeal Is Assigned to a Reviewer

Your appeal enters the insurer's internal review process. It will be assigned to a medical reviewer — typically a nurse or physician reviewer employed by or contracted with the insurer.

Under federal law, this reviewer must:

• Be someone different from the person who made the original denial
• Have clinical expertise appropriate to your type of claim (for specialty-specific denials, you have the right to request that a reviewer with relevant expertise review your case)

Action: If your case involves a specialty condition (oncology, neurology, cardiology, etc.), and the denial was made by a general practitioner or non-specialist reviewer, you can request that your appeal be reviewed by someone with appropriate specialty expertise. This matters and is worth requesting in writing.

Step 3: The Review Period

The insurer must respond to your appeal within federally mandated timeframes:

Urgent care / expedited review: 72 hours — this is for situations where your health is at risk from waiting. If you requested expedited review, the insurer must respond within 3 days.

Pre-service (Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization) appeals: The insurer must respond within 30 days of receiving your appeal.

Post-service (claims already incurred) appeals: The insurer must respond within 60 days.

Note: Some plans have shorter timelines for certain appeal types. Check your plan documents.

Action: Calendar the response deadline. If you haven't heard by the deadline, call immediately. A failure to respond within the required timeframe may itself be a violation you can report.

Possible Outcome 1: Your Appeal Is Approved — Denial Reversed

This is the best outcome, and it happens. Studies show 40–83% of properly filed appeals succeed.

What this means:

• Your claim is approved and will be processed
• If you already paid out-of-pocket for the denied service, you should be reimbursed according to your plan's cost-sharing terms
• If you haven't received the service yet (prior authorization), you should now be able to proceed

Action: Get the approval in writing. Confirm the effective date. If the claim needs to be reprocessed, follow up with your provider's billing department to make sure the resubmission happens.

Possible Outcome 2: Your Internal Appeal Is Denied Again

This is the more common initial outcome — many internal appeals are denied. This is not the end of your road.

You now have additional options:

External Independent Review: Under the ACA and ERISA, most plans must offer access to an external review by an IROs) Explained" class="auto-link">Independent Review Organization (IRO). The IRO is entirely independent — no financial relationship with your insurer. Their decision is binding on the insurer.

External reviews overturn insurer decisions roughly 40% of the time. For certain types of denials — experimental treatment, mental health parity, emergency care — external reversal rates can be higher.

Your timeline: You typically have 60 days from the internal appeal denial to request external review (4 months for ERISA plans). Request it immediately.

Possible Outcome 3: You Don't Hear Anything

If the insurer misses their response deadline, don't just wait. This silence may itself be grounds for escalation.

Action: Call immediately on the day the response was due. If you get no resolution, file a complaint with your state insurance commissioner for failure to process your appeal within required timeframes. This type of complaint gets rapid attention.

After External Review: The Final Stages

If external review upholds the denial, your formal insurance appeal process is typically complete. But you still have options:

State insurance commissioner complaint: A formal regulatory complaint can trigger an investigation and put real pressure on the insurer. Some complaints result in insurer reversals outside the formal appeal process.

State insurance ombudsman: Many states have free ombudsman offices that advocate for consumers in insurance disputes. These can be valuable allies.

Legal action: For high-value denials, bad faith conduct, or clear violations of law (parity violations, ACA violations, ERISA violations), consulting an insurance attorney is appropriate. Many work on contingency.

Additional appeals levels for Medicare: Medicare has a five-level appeals process. If you're on Medicare and your first level was denied, you have four more levels available, with escalating review authority.

While You Wait: Protect Yourself

During the appeal process:

• Don't skip treatment you need — if you need care urgently, get it and keep records of all related bills. A successful appeal may result in retroactive reimbursement.
• Keep detailed records of how the denial is affecting your health or life — this may support your appeal or a later complaint
• Document everything — every call, every letter, every email, every portal notification
• Track out-of-pocket spending — if you're paying for care that should be covered, document every dollar

You Are Not Alone in This Waiting Room

The hardest part of this process is often the waiting — not knowing whether you'll win, whether your care is actually going to happen, whether you made the right arguments.

The uncertainty is real. But so is the win rate for properly filed appeals. Keep going.

Fight Back With ClaimBack

ClaimBack helps you build your strongest appeal and navigate every step of the process — from initial filing through external review.

Start your appeal at https://claimback.app/appeal

File, follow up, and fight through every level until you win.

Related Reading

• Internal vs. External Insurance Appeal: Which Should You File?
• How to Request an External Review of an Insurance Denial
• How to Write an Insurance Appeal Letter