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
No source-derived completion estimate has been certified for this form yet.
Difficulty
Source review needed
The walkthrough has not completed source-to-output proof.
Best for
People confirming an official Social Security Administration, Federal, USA document
Confirm the fit against the official source before sharing sensitive information.
What do I need before I start?
Antes de empezar
Lo que debe saber antes de empezar.
Para qué sirve
This form is not source-to-completion certified. Check the official instructions and final PDF before you sign or send it.
Tenga en cuenta
Revise nombres, fechas, firmas y documentos de respaldo antes de enviar el formulario.
Lo que necesita
Read the official instructions and gather the names, dates, identifiers, and supporting details they require.
What happens after I complete it?
- 1. Prepare your information
Gather the details listed above. Use the official PDF or the guide when available.
- 2. Review your document
Check names, dates, and answers before downloading or printing.
- 3. Follow the official instructions
Confirm signatures, attachments, recipient, and deadlines. Downloading does not submit the form.
View the official PDF
Fuente del PDF
Formulario oficial en blanco
Enlaces de la fuente y copia guardada
Del emisor: https://www.ssa.gov/forms/cms-40b.pdf
Copia guardada en Docgle: https://api.staging.docgle.ai/documents/f64ed2b9-c5d9-46e7-9b89-3e27e1876a64/original
Source, revision & details
Source confidence
Guided walkthrough ready
Docgle has checked this guided interview against an official source. Confirm the final result before signing or sending it while full source-to-completion certification is completed.
Walkthrough status
Guided walkthrough ready
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