What about my HSA?
To avoid a tax penalty, you should stop contributing to your Health Savings Account (HSA) at least 6 months before you apply for Medicare. https://www.medicareinteractive.org/get-answers/coordinating-medicare-with-other-types-of-insurance/job-based-insurance-and-medicare/health-savings-accounts-hsas-and-medicare
Put Your HSA Savings to Use
Once you sign up for Medicare, you can no longer contribute money into your Health Savings Account. However, you are still able to withdraw money tax free to cover eligible medical expenses, Medicare premiums and premiums for Insurance Trust’s health plans. The Insurance Trust cannot provide individual tax advice, members are encouraged to consult with their tax advisor.