MEDICARE Sign Up For Medicare Part A and B Get Started MEDICAID Application to apply for Medicaid Get Started SOCIAL SECURITY Full Retirement Age Calculator for Social Security. Get Started LOW-INCOME SUBSIDY Eligibility for Low-Income Subsidy Get Started SF-5510 Authorization Agreement for Preauthorized Payments Get Started CMS-L564 Medicare Request for Employment Information Get Started SSA-44 Request to lower an Income-Related Monthly Adjustment Amount (IRMAA) Get Started SSA-40B Request for Enrollment in Medicare Part B (Medical Insurance) Get Started