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How to Fax Medicare Form 40B | Part B Enrollment | SecurelyFax

CMS Form 40B, the application to enroll in Medicare Part B, can be submitted to Social Security by mail or fax, or handled in person at a local office. If you are faxing it, you can do that online without a machine, using email, a browser upload, or a phone scan, and keep a delivery confirmation.

Submission options for Form 40B

Form 40B is processed through Social Security, and the documented routes include mail and fax as well as in-person handling at a local office. Because details can change and can depend on your circumstances, confirm the current submission method and the destination fax number on the official form instructions before sending.

Timing matters: enrollment windows

Medicare's General Enrollment Period runs January 1 through March 31 each year, and Open Enrollment runs October 15 through December 7. Because enrollment is deadline-driven, getting your form submitted promptly and keeping proof of delivery is worth the small effort. Online fax lets you send the moment the form is complete rather than waiting on a store's hours.

Fax Form 40B online

  1. 1
    Complete and sign Form 40B
    Fill in the form and sign it where required.
  2. 2
    Get it onto your device
    Save a PDF or photograph the signed pages with your phone.
  3. 3
    Enter the destination fax number
    Use the number from the official instructions and double-check it.
  4. 4
    Send and save the confirmation
    Send and keep the confirmation with your enrollment records.
SecurelyFax is not affiliated with Medicare, CMS, or the Social Security Administration. It transmits your completed form and gives you a confirmation. Rely on the official Form 40B instructions for the current method and number.

Frequently asked questions

Can I fax Medicare Form 40B?
Yes. Form 40B can be submitted to Social Security by fax or mail, or handled in person, depending on your situation. Confirm the current process on the official instructions.
When can I enroll in Part B?
The General Enrollment Period runs January 1 through March 31, and Open Enrollment runs October 15 through December 7.
Do I need a fax machine?
No. You can fax the form online from email, an upload, or a phone scan.
How do I prove I sent it on time?
Keep the delivery confirmation produced after a successful send.
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Last reviewed: 2026-05-30

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