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If you are already enrolled in Medicare Part A and you would like to enroll in Part B under the Special Enrollment Period (SEP), you can apply online at Apply for Medicare Part B Online during a Special Enrollment Period. You can upload your application and documents that verify your group health plan coverage through your employer.

You can also fax or mail your completed CMS-40B, Application for Enrollment in Medicare – Part B (Medical Insurance) and the CMS-L564, Request for Employment Information enrollment forms and evidence of employment to your local Social Security office. If you have questions, please contact Social Security at 1-800-772-1213 (TTY 1-800-325-0778).

Note: When completing the forms CMS-40B and CMS-L564:

  • State “I want Part B coverage to begin (MM/YY)” in the remarks section of the CMS-40B form or online application.
  • If your employer is unable to complete Section B, please complete that portion as best as you can on behalf of your employer without your employer's signature.
  • Also submit one of the following forms of secondary evidence:
    • Income tax returns that show health insurance premiums paid.
    • W-2s reflecting pre-tax medical contributions.
    • Pay stubs that reflect health insurance premium deductions.
    • Health insurance cards with a policy effective date.
    • Explanations of benefits paid by the GHP or LGHP.
    • Statements or receipts that reflect payment of health insurance premiums.

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