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How to Fax a Health Insurance Claim or Appeal

Some health plans accept claim forms and appeals by fax. Here's how to find the right channel, what to include, and the deadlines that apply to appeals.

Published: 2026-10-19

If your health plan denied a claim, or you need to send a claim form or supporting documents yourself, the plan tells you where to send them. Many plans have an online portal, but some also list fax. Humana, for example, tells Medicare members they can send appeal and grievance forms to the address or fax number on the form. Blue Cross NC says paper claim forms can go to the mailing address or fax number provided. If your plan gave you a fax number, you can send your documents from your phone or computer with AnytimeFax, without a fax machine, account or subscription. Some channels don't list fax at all, such as Original Medicare appeals, so always follow your notice.

For individuals sending their own information

AnytimeFax is for people sending their own documents, or documents they are authorized to send on their own behalf. AnytimeFax is not a HIPAA business associate and does not sign Business Associate Agreements. Healthcare providers, health plans and other covered entities must not use AnytimeFax to send protected health information on their behalf.

Appeal deadlines are short

HealthCare.gov says you must file an internal appeal within 180 days (6 months) of receiving notice that your claim was denied. For Medicare Advantage plans, Medicare.gov says you must appeal within 65 days from the date on the plan's initial denial notice. Check the date on your own notice.

What you need

  • The fax number for claims or appeals, taken from your denial notice, the plan's form or your plan's official website.
  • Your health insurance ID number and the claim number from your denial notice or Explanation of Benefits.
  • Your documents as a PDF, DOC or DOCX file — up to 10 MB in total and 20 pages per order (larger jobs can be quoted).
  • An email address to receive a one-time verification code.

Step-by-step

  1. Read your denial notice first

    HealthCare.gov says insurers must tell you why they denied your claim and how you can dispute the decision. For Medicare Advantage, Medicare.gov says to follow the directions in the plan's initial denial notice. Use the channel and fax number that notice or the plan's form gives you.

  2. Prepare your appeal or claim

    For an appeal, HealthCare.gov says to complete the forms your insurer requires, or write to your insurer with your name, claim number and health insurance ID number. Add anything you want the insurer to consider, such as a letter from your doctor. For a claim, use the plan's claim form and attach the receipts it asks for.

  3. Put your IDs on every page

    Add your member ID and claim number to each page, or to a cover page that lists how many pages follow. That helps the plan match loose pages to your file.

  4. Scan and upload

    Scan each page so the text is readable, and black out anything the plan didn't ask for. Upload one or more files on Send a Fax. They are merged in the order you upload them. Type the fax number and compare it with your notice or form.

  5. Verify your email and pay

    Enter the one-time code sent to your email. Because health information is sensitive, you'll confirm at checkout that you're sending it on your own behalf. Your first one-page fax is free (once per email address). After that: $4.99 for 2–4 pages, $5.99 for 5–10 pages and $7.99 for 11–20 pages. If you already used the free fax, a single page costs $4.99 (Standard) or $20 (Urgent).

  6. Keep proof and follow up

    Save your order ID (it starts with AF-) and the invoice from the Track Order page. Write down the date you sent the fax, and call your plan to confirm it received your appeal or claim.

Tips

  • In urgent care cases, HealthCare.gov says you may file an internal appeal and an external review request at the same time, and the decision must come as quickly as your medical condition requires.
  • If your internal appeal is denied, HealthCare.gov says you can ask for an external review within 4 months. For the HHS-administered process, it lists online, fax, mail and email; some states run their own process, so follow your notice.
  • HealthCare.gov says the Consumer Assistance Program in your state can file an appeal for you.
  • Blue Cross NC asks for the original receipt with a claim. If your plan asks for originals, check whether a faxed copy is enough before you rely on fax.
  • For prior authorization, CMS requires Medicare Advantage, Medicaid and CHIP payers to decide expedited requests within 72 hours and standard requests within 7 calendar days, starting January 1, 2026. Your doctor's office often handles the request, so ask before you send paperwork yourself.

Common mistakes

  • Missing the appeal deadline on your denial notice while waiting for a callback.
  • Faxing an appeal to a general customer service number instead of the appeals fax number on your notice or form.
  • Leaving off the claim number or member ID, so the pages can't be matched to your file.
  • Faxing an Original Medicare appeal when Medicare.gov tells you to send it to the address on your Medicare Summary Notice.
  • Assuming a delivered fax means your appeal has been accepted or approved.

Delivery expectations

Standard, Extended and Large orders are delivered within 24 hours, and the free one-page option can take up to 3 days. Urgent orders ($20, up to 20 pages) are processed within 90 minutes of payment confirmation. A successful delivery confirms that the fax was transmitted to the recipient's fax number; it does not confirm that someone has reviewed or accepted your document. Appeal and claim decision times are set by your health plan and by federal and state rules, not by AnytimeFax.

Alternatives

  • Your health plan's member portal or online appeal form, when it offers one.
  • Mail to the address on your denial notice or the plan's form.
  • For Original Medicare: the Redetermination Request Form sent to the contractor address on the last page of your Medicare Summary Notice.
  • Your state's Consumer Assistance Program, which HealthCare.gov says can file an appeal for you.
Fax Your Claim or Appeal

Frequently asked questions

If your plan lists fax, yes. Humana, for example, tells Medicare members they can send appeal forms to the address or fax number on the form. Use the number on your denial notice or the plan's form.

HealthCare.gov says 180 days from the denial notice for an internal appeal. Medicare.gov says 65 days from the initial denial notice for Medicare Advantage. For Original Medicare, file by the date in your Medicare Summary Notice.

HealthCare.gov says internal appeals must be completed within 30 days for a service you haven't received yet and 60 days for one you already received. Urgent cases must be decided as quickly as your condition requires.

Medicare.gov tells you to send the Redetermination Request Form to the contractor address on the last page of your Medicare Summary Notice. It doesn't list fax, so follow your notice.

No. AnytimeFax is not a HIPAA business associate and does not sign Business Associate Agreements. It is meant for individuals sending their own information.

Files are uploaded over HTTPS, stored encrypted with AES-256 and automatically deleted 30 days after your order is completed. Only you and authorized operators can open them.

Official sources

Last verified: 2026-10-18

AnytimeFax is an independent service operated by Rise & Built Corp. It is not affiliated with Humana, Blue Cross NC, any health plan, HealthCare.gov, Medicare, CMS or any government agency. Third-party requirements were checked on the date shown above; always confirm current requirements with the recipient. This page is general information, not legal or medical advice.