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Enrolling in Medicare Part B? Unsure about enrollment windows or SEP proof? Fill out your CMS‑40B for free with easy AI walkthroughs.
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We guide you through the CMS-40B, place your answers on the official form, and show you the final result before you download it.
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We explain every question in plain language, so you always know what you are answering.
Review before you file
Before submission, confirm your enrollment window and whether CMS-L564 is needed for your Special Enrollment Period case.
What is the CMS-40B?
CMS-40B is used to enroll in Medicare Part B. Officially, it is the Application for Enrollment in Medicare - Part B (Medical Insurance) . It is used when you want Part B medical insurance coverage.
People often file CMS-40B when they already have Part A. The General Enrollment Period runs January 1 through March 31 each year, with coverage typically starting July 1. Some Special Enrollment Periods may require CMS-L564.
Who needs to fill one out?
People enrolling in Medicare Part B commonly use CMS-40B.
- People with Medicare Part A adding Part B
- People enrolling during the General Enrollment Period
- People using a Special Enrollment Period with employer coverage history
- Applicants who need CMS-L564 support for SEP situations
- Anyone directed to use CMS-40B