Medicare Part B Enrollment Application (Form CMS-40B)
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Official Source:Social Security AdministrationChecked Jul 2026What is CMS-40B used for?
Adds Medicare Part B (medical insurance) for someone who already has Part A. You tell Social Security who you are, check the YES box for Part B, sign, and send it in.
Time, difficulty & who this form is for
Average time
Varies
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Difficulty
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Best for
People confirming an official Social Security Administration, Federal, USA document
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Before you start
What to know before you start.
What this form does
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Keep in mind
Check names, dates, signatures, and supporting documents before submitting the form.
What you’ll need
Read the official instructions and gather the names, dates, identifiers, and supporting details they require.
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- 1. Prepare your information
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- 3. Follow the official instructions
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View the official PDF
PDF source
Official blank form
Source and saved-copy links
From the issuer: https://www.ssa.gov/forms/cms-40b.pdf
Docgle cached copy: https://api.staging.docgle.ai/documents/f64ed2b9-c5d9-46e7-9b89-3e27e1876a64/original
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Agency
Social Security Administration
Form identifier
CMS-40B
Estimated time
Varies
Revision
Form CMS-40B (1-90) EF (10-2001)
Verified
Jul 2026
Jurisdiction
Social Security Administration, Federal, USA