BuildMyEvidence · guide
How to Appeal a Denied Insurance Claim
The short answer: To appeal a denied insurance claim, keep the denial letter, save every document (your policy, bills, and Explanation of Benefits), log every phone call with the date, time, name of who you spoke to, and what was said, then submit a written appeal before the deadline. An appeal is built from an organized, dated paper trail.
Last updated Oct 6, 2026
Written by Dave Shelton, founder of BuildMyEvidence. Thirty years in business taught him that the person with a clear record gets taken seriously.
A denial isn't the end — it's the start of the appeal. This guide shows you how to document one that works.
Can a denied insurance claim really be overturned?
Denials happen for many reasons — missing information, coding errors, or questions about coverage — and an appeal is how you ask for the issue to be looked at again. A clear record is what an appeal is built from.
What should I document to appeal a denial?
- The denial letter — it states the reason and, crucially, your deadline to appeal.
- Your policy and coverage documents.
- All bills and your Explanation of Benefits (EOB).
- A dated log of every phone call: the date, time, who you spoke to, and what was said.
- Any letters, forms, or supporting evidence (like a doctor's letter of medical necessity).
Why should I log every phone call with my insurer?
Because insurers keep records of your calls, and you should too. Note the date, time, the name of the person you spoke with, and exactly what they told you. If you're given a promise, a reference number, or conflicting information, write it down in your dated log. Calls where "nobody wrote anything down but you" are common — and your notes become the record.
How do I find my deadline to appeal?
Read the denial letter carefully — it should set out how to appeal and by when. Whatever date it gives you, write it down the moment the letter arrives and record the date the letter itself is dated, the date you received it, and the date you sent anything back. Those three dates are the ones people wish they had later, and giving yourself time is always better than working to the edge of a date.
What makes an appeal stronger?
A clear, organized, dated record. When your appeal presents the denial, the relevant policy language, the supporting documents, and a documented history of your contacts — all in order — it's far easier for a reviewer to see the error and reverse it. Disorganized appeals are easy to deny again; well-documented ones are hard to ignore.
When should I start documenting?
The moment you receive the denial — or ideally from when you first filed the claim. Start your dated log with the denial letter, note your deadline, and record every contact from that point on. The sooner you begin, the more complete your paper trail and the stronger your appeal.
Frequently asked questions
How long do I have to appeal a denied insurance claim?
Check the deadline stated on your denial letter or your plan, and write it down.
What should I keep after a claim is denied?
The denial letter, your Explanation of Benefits, all correspondence, and dated notes from every phone call — name, date, time, and what was said.
Can I get a denial overturned?
An appeal is how you ask. A clear, documented case is what it is built from.
What documents do I need for an appeal?
The denial letter, policy documents, medical records or bills, a letter of medical necessity if relevant, and your written appeal — all dated and organized.
General information, not legal advice. Laws vary by location. For your situation, consult a qualified lawyer. How we write these