If your parents claimed you as a dependent on their tax return, you won't enter health insurance on your return. If they didn't claim you as a dependent, you'll enter the shared Marketplace health insurance policy Form 1095-A that you had with your parents for the time that you had it.
You can review this TurboTax article I'm on my parents' 1095-A form. What do I do on my return? for more information. To enter Form 1095-A refer to the TurboTax Help article Where do I enter my 1095-A?
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