Quote:
Originally Posted by jump4
It is truly amazing how much confusion and misinformation in this thread!
The OP apparently has an HDHP through the FEHB program for Federal Employees.
That HDHP insurance company probably opened an HSA at a financial firm of it's choosing, and contributed to it each year. Different insurance companies partner with different HSA trustees.
OP can keep that same HDHP plan and companion HSA account after retirement. However, once you reach age 65 and enroll in Medicare, you can no longer contribute to an HSA. If OP keeps the HDHP plan while on Medicare, contributions will be put into an FSA instead of the HSA.
You can (and probably should sometime) do a direct rollover from one HSA to another HSA. Fidelity HSA is the highest rated with no fees and no minimum balance.
Transfer Your HSA | Health Savings Account | Fidelity Investments 
For HSA ratings, see:
Best HSA Account Providers In 2022 | The College Investor
The Best HSA Accounts and Providers Guide | Morningstar |
You do not have to take Medicare, you can keep your federal plan. Take Medicare part A because it is free and do not take B or supplemental plans.