How to fax a health insurance appeal, and prove they got it

1. Find the right fax number

Use the number in your denial letter or Explanation of Benefits, in the section that explains how to appeal. That letter controls: appeals departments often have a different fax number from claims or customer service, and it can differ by plan and by state.

If the letter gives only a mailing address, call the member number on your insurance card and ask for "the fax number for member appeals". Write down the name of the person who gave it to you and the date.

2. Check your deadline before anything else

For most employer plans and marketplace plans, federal rules give you at least 180 days from the date you received the denial to file an internal appeal. Medicare, Medicaid and some other plans use different deadlines, so check the letter. The date that counts is the date the insurer receives the appeal, which is one reason proof of delivery matters.

3. Put the packet together

• Your appeal letter: what was denied, why the denial is wrong, and what you are asking for.
• A copy of the denial letter or Explanation of Benefits.
• A letter of medical necessity from your doctor, if the denial was about necessity.
• Records, test results or plan language that support you.

Combine everything into one PDF in that order. Keep the original.

4. Add a cover sheet and number every page

The cover sheet should show your name, member ID, claim number, date of service, the words "Member appeal", a phone number, and the total page count. Then put your name, claim number and "Page 3 of 12" on every page. Fax pages get separated; this is how they find their way back together.

5. Send it and keep the confirmation

The transmission report is the proof. It should show the fax number dialed, the date and time, the number of pages sent, and a result of "OK" or "Success". Save it with your packet. If it shows fewer pages than you sent, or an error, send the whole thing again.

6. Confirm receipt and note when the answer is due

Call the next business day, confirm the appeal is logged, and ask for a reference number. Under the same federal rules, insurers generally have 30 days to decide an appeal about care you haven't had yet, 60 days for care you've already received, and 72 hours for urgent cases. Put that date in your calendar.

If the internal appeal is denied, you can usually ask for an independent external review. The federal standard gives you four months from the final denial to request it.

When to add certified mail

For a large claim, or when you are close to the deadline, send a second copy by USPS Certified Mail with a return receipt. The fax gets it there today; the return receipt gives you a signature. See what a return receipt proves.

Rather not do the faxing yourself?

That is what we are building: you upload the appeal, we fax it to the appeals department, send you the confirmation and remind you when the answer is due.

This guide is general information, not legal advice. Your denial letter and plan documents set the rules for your appeal.