Appeal a Denied Insurance Claim
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Appeal a Denied Insurance ClaimYour Rights When Insurance Says No
Step-by-step guide to appealing denied insurance claims. Learn how to write an appeal letter, gather evidence, and get your treatment covered.
Don't Miss Your Deadline
Many plans subject to federal claims rules provide at least 180 days to request an internal appeal, but the denial notice and plan documents control. Check the notice and act promptly.
The Problem
Insurance companies deny claims for many reasons—some valid, many not. Common denial reasons include 'not medically necessary,' 'out of network,' 'prior authorization required,' or 'experimental treatment.'Many patients give up after the first denial, not realizing they have strong appeal rights.
The Solution
Many plans provide an internal appeal process, and some provide external review. The denial notice and plan documents determine the applicable route, deadlines, and evidence requirements. This guide walks you through organizing the record and preparing a fact-based appeal.
Common Reasons for Appeal a Denied Insurance Claim
- 1Not medically necessary (insurer doesn't think you need the treatment)
- 2Prior authorization not obtained (approval wasn't requested before treatment)
- 3Out-of-network provider (doctor or facility not in your insurance plan)
- 4Experimental or investigational (treatment not FDA-approved or standard of care)
- 5Coding or billing errors (wrong codes submitted by provider)
- 6Duplicate claim (appears to be a repeat of previous claim)
- 7Pre-existing condition exclusion (for older plans without ACA protections)
- 8Coverage limits exceeded (you've hit your annual or lifetime maximum)
How to Respond: Step-by-Step
Understand the Denial Reason
Request a detailed written explanation of why your claim was denied. Common reasons include 'not medically necessary,' 'out of network,' or 'missing prior authorization.'
Review Your Policy
Check your insurance policy documents to understand what's covered. Look for the specific exclusions or requirements that led to the denial.
Gather Supporting Documentation
Collect medical records, doctor's notes, and any research supporting medical necessity. Get a letter from your doctor explaining why the treatment is necessary.
File an Internal Appeal
Submit a written appeal within the deadline (usually 180 days). Include your explanation, supporting documents, and a clear request to reverse the decision.
Request an External Review
If the internal appeal is denied, file for an external review with your state insurance department. An independent third party will review your case.
Follow Up Persistently
Call weekly to check on your appeal status. Document every interaction. Escalate to supervisors if needed. Most appeals that are pushed through succeed.
Insurance Appeal Letter Template
Customizable letter template with all required elements for a successful appeal
Need Personalized Help?
FairVisitHealth members get AI-powered appeal letters, call scripts, and step-by-step guidance for insurance disputes.
Frequently Asked Questions
What should I do if my insurance claim is denied?
First, request a detailed explanation in writing. Then file an internal appeal within 180 days, including your doctor's letter of medical necessity. If denied again, file an external review. FairVisitHealth provides appeal letter templates to help.
What is prior authorization and why was my procedure denied?
Prior authorization is insurance approval required before certain procedures. Denials happen when the procedure is deemed not medically necessary, out-of-network, or if proper documentation wasn't submitted. You can appeal with additional medical records.
What are my rights under the No Surprises Act?
The No Surprises Act protects you from unexpected out-of-network charges for emergency care and certain non-emergency services at in-network facilities. If you receive a surprise bill, you can dispute it and the provider must follow federal arbitration rules.
Can I negotiate out-of-network medical bills?
Yes! Out-of-network bills are often the most negotiable. Request the cash-pay rate, which is usually well below the amount originally billed. You can also negotiate a payment plan or apply for financial assistance programs.
How long do I have to appeal a denied claim?
For many employer and individual health plans subject to federal claims rules, the internal appeal period is at least 180 days, but your denial notice and plan documents control. External-review eligibility, routing, and filing deadlines vary by plan, state, and federal program; follow the instructions in the final denial notice.
What is the success rate for insurance appeals?
There is no single success rate that predicts an individual appeal. A focused appeal should address the denial reason and include only documentation that supports the claim, such as the EOB, relevant plan language, and records actually available.
What's the difference between internal and external appeals?
An internal appeal is reviewed through the plan's claims procedure. An external review, when available under the plan and applicable law, is handled by an independent reviewer. Check the final denial notice for eligibility, filing instructions, and whether the decision is binding.
Can I appeal if my doctor says the treatment is necessary?
Absolutely—a letter of medical necessity from your doctor is one of the strongest pieces of evidence for an appeal. Ask your doctor to provide detailed documentation explaining why the treatment is medically required for your specific condition.
What if my appeal is denied?
If the internal appeal is denied, read the final denial notice for any external-review option, deadline, and filing route. A state insurance department may not regulate a self-funded employer plan; confirm the regulator before filing, and consider contacting the plan administrator, EBSA, or a qualified advocate.