Deductible on my Health Insurance?

I am a little fuzzy on a few aspects of health insurance. I am a dependent on my fathers insurance, and I am going to my first therapy session today. My therapist asked me to make sure if I have some kind of deductible (for some reason I think she threw out the number $200).
Im not quite sure what this means. I have a feeling it has to do with how much you get back from taxes, though I could be wrong.
What exactly is it, and how do I know if I have it?

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