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Sign up for Part B only

Part B helps pay for your basic healthcare services. If you already have Part A, you can add Part B during specific enrollment periods.

It's important to sign up promptly to avoid gaps in coverage or late enrollment penalties. Your coverage generally begins the first day of the month after you sign up.

When you're ending an employer group health plan

If you’ve been covered by an active employer group health plan (either yours or your spouse's) since turning 65, and it ended within the last 8 months, you can enroll in Part B without any penalty. This is considered a “Special Enrollment Period.” See exactly when to sign up.

Other times to sign up

When you have a special situation

In certain situations, Medicare offers different enrollment periods for a limited time. This allows you to sign up without penalties during these windows.

When you miss the enrollment periods above

You can apply during the "General Enrollment Period" each year between January 1 and March 31. There are often penalties when signing up at this time. 

Complete and mail the Application for Enrollment in Medicare Part B (CMS-40B) (PDF) to your local office.

Other ways to complete this task

Mail or fax us your application

Fill out the Application for Enrollment in Medicare Part B (CMS-40B) (PDF).

If you are applying during the Special Enrollment Period, also fill out the Request for Employment Information (CMS-L564) (PDF).

If you have a special situation, fill out the Application for Medicare Part A and B — Special Enrollment Period (Exceptional Conditions) (CMS-10797) (PDF).

Find your Social Security office and fax or mail us the completed form.

For support completing this task

Set up an appointment

Available in most U.S. time zones Monday through Friday, 8 a.m. to 7 p.m., in English, Spanish, and other languages.

Tell the representative you need help with enrolling in Part B during the Special or General Enrollment Period.