If you already have Medicare Part A and wish to sign up for Medicare Part B, please complete form CMS 40-B, Application for Enrollment in Medicare - Part B (Medical Insurance), and take or mail it to your local Social Security office. You can also call Social Security’s toll-free number 1-800-772-1213 (TTY 1-800-325-0778). or contact your local Social Security office.
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Medicare Benefits
Center of Medicare & Medicaid Services
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