What should I do with my Medicare coverage when retiring to Thailand?

I only have the free Medicare Part A. I declined to sign up for Medicare Part B. You can’t use Medicare here and I am committed to staying in Thailand. I would live here a year or two before completely cutting ties with your home country. I even continued to pay California state taxes the first couple of years. If you want to pay for private health insurance then do your shopping and buy in as early as possible. Your policy will exclude preexisting conditions so have savings and/or income to cover those expenses.