Medicare Enrollment Guidelines

If you are retiring soon and are eligible for Medicare Part A and B due to age or disability, it is important that you (and your spouse, if they are Medicare eligible) start the application process for Medicare

Part A and Part B 90 days prior to your retirement date.

Although Social Security offices are closed to the public for in-person service, they are still processing Medicare enrollment requests received by mail or fax. Social Security does not support online enrollment of Medicare.

If you already have Medicare Part A and wish to sign up for Medicare Part B, you must submit the two required forms listed below, (CMS 40B and CMS L-564).

You have three options to submit your enrollment request under the Special Enrollment.

Note When completing the CMS-L564

  • State on the form “I want Part B coverage to begin (MM/YY)”
  • Yale retirement counselor will complete section B and provide the form to you to submit to the Social Security office. 

If you are enrolling in both Medicare Part A and Part B, you must call Social Security at 1-800-772-1213 to begin the Medicare application process.

You can find the address to your local office using the Social Security Office Locator. You can also call the Social Security Office at 1-800-772-1213.

  • Form CMS 40B. - This form is to be completed by the retiree and/or spouse if they already have Medicare Part A and are only enrolling in Medicare Part B. CMS Website.    
  • Form MS L 564. - This form is required if you are enrolling Medicare Part A or B, or both.  It should be completed by a Yale retirement counselor. If you have not met with a Yale retirement counselor, please contact Yale Employee Services at 203-432-5552. CMS Website.

It is important to mail or fax these forms to your local Social Security Office in a timely manner (90 days prior to your Medicare Part B effective date). Please make a copy of both forms for your records.

When you, or your spouse, have received confirmation of your Medicare Part B enrollment, you should contact the Aetna Retiree Service Center at 800-338-4533 to enroll in your retiree health plan.