Social Security Administration
You can find your current Social Security statements at SSA.gov.
You can find more information about Medicare, coverage, costs, and plans at Medicare.gov.
If you had a major life-changing event and your income has gone down, you can use form SSA-44 to request an adjustment to you Income-Related Monthly Adjustment Amount.
Public Health Insurance
You can find more information about public health insurance options at HealthCare.gov.