Get the forms you need to sign up for Part B including CMS-40B, CMS-L564, CMS-10797, and CMS-10798. This form is your application for Medicare Part B (Medical. Insurance).For questions about Medicare or Medicaid coverage, visit the Medicare website or the Medicaid website. Forms. Get Medicare forms for different situations, like filing a claim or appealing a coverage decision. AHN offers a variety of in-network options. Fill out this form. 2. Sign and date it on page 1 and page 15. 3. Who can use this form? Select your plan choice on the application. Health Care Coverage.