Can you have your parents leave the room in a doctors office even if they don’t want to?

I’m 16 and I have had a conversation about my mom leaving the room when I go to the doctor she denied and said she did not want to leave the room and if she requested to be in the room she can, and I want to talk to my doctor about private information but is what she saying true?
Can you have your parents leave the room in a doctors office even if they don’t want to?
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