Texas has a free helpline to guide residents through the complexities of Medicare. Get Medicare forms for different situations, like filing a claim or appealing a coverage decision.Find Forms. Publications. Fill out this information as it appears on your Medicare card. OR. • Attach a copy of your Medicare card or your letter from the Social Security. By completing this enrollment application, I agree to the following: Aetna Medicare is a PDP, HMO, PPO plan with a Medicare contract. Enrollment in our plans. Get the forms you need to sign up for Part B including CMS-40B, CMS-L564, CMS-10797, and CMS-10798. Medicare is our country's health insurance program for people age 65 or older. Please read all instructions below before completing this form.