You can continue to use your account tax-free for out-of-pocket health expenses. When you enroll in Medicare, you can use your account to pay Medicare premiums, deductibles, copays, and coinsurance under any part of Medicare. If you have retiree health benefits through your former employer, you can also use your HSA account to pay for your share of retiree medical insurance premiums. The one expense you cannot use your account for is to purchase a Medicare supplemental insurance or a Medigap policy.
Once you turn age 65, you can also use your account to pay for things other than medical expenses if they are considered qualifying medical expenses. If used for other expenses, the amount withdrawn will be taxable as income but will not be subject to any other penalties. Individuals under age 65 who use their accounts for non-medical expenses must pay income tax and a 10% penalty on the amount withdrawn.