By "last year", you mean 2022? If so, Mike (the other Mike) is right. If you can withdraw everything you contributed in 2022.
When you go through TurboTax in the HSA interview, and state the months that you had Medicare, the TurboTax will tell you that you had excess HSA contributions. The instant that this happens, the excess dollars will be added to Other Income, which solves your problem of how to report them. If you did not make these contributions through your employer but contributed directly, then TurboTax will just reduce the amount that you deduct on line 13 of Schedule 1 (1040), which also solves your problem.
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