Get Medicare forms for different situations, like filing a claim or appealing a coverage decision. Find Forms. Publications.Get the forms you need to sign up for Part B including CMS-40B, CMS-L564, CMS-10797, and CMS-10798. Name of Insurance - Enter name of the health insurance or entity liable for payment other than Medicaid. How do I file a claim? You can download and fill out a form, called the Patient Request for Medical Payment form (CMS-1490S). Clinics, group practices, and other suppliers must complete this application to enroll in the Medicare program and receive a Medicare billing number. Medicare will pay you directly when you complete this form and attach an itemized bill from your doctor or supplier . Fill out form CMS-40B. Go to "Apply Online for Medicare Part B During a Special Enrollment Period" and complete CMS-40B and CMS-L564.