My mom, 82, who is a US citizen and receives Social security , lived abroad for the past 25 years, and never signed up for Medicare, even part A. She is returning to the US. How does she sign up for Medicare?
Part A coverage is automatic for people receiving Social Security benefits, so you mother should already be signed up for that even if she's unaware of it. She can sign up for Part B of Medicare in the current general enrollment period that runs through March 31st by contacting Social Security. For more information, refer to their website: https://www.ssa.gov/medicare/.