The CMS-40B form is for enrolling in Part B. You must apply for Part A first.
Application for Enrollment in Medicare Part B
Request for Employment Information
The CMS-L564 form is used when applying for employer group health plan coverage.
Medicare Easy Pay
This form is used to sign up for Medicare's Easy Pay electronic, automatic payment option.
Medicare & You
This handbook covers plans and benefits, beneficiaries' rights, and frequently asked questions.