If you are on Medicare, you will not receive a Form 1095-A. The Medicare premiums you pay will show on your Social Security statement, Form SA-1099.
You may also receive a 1099-B form, a tax form that reports the type of health insurance coverage you have, any dependents covered by your insurance policy, and the period of coverage for the prior year. This form is used to verify on your tax return that you and your dependents have at least minimum qualifying health insurance coverage.
It is not necessary to have Form 1095-B to file your taxes. For more information, please see this TurboTax Help article: What is Form 1095-B: Health Coverage
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