Can the subscriber to my health insurance policy contact the clinic I am seen at to talk about financials?

i am seen at a psych clinic and my mom is the subscriber of my insurance. I really do not want her calling and talking with them but someone told me that because she is the subscriber of the policy she has access to my financials at the psych clinic, is this true?
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True. As the subscriber, it's HER insurance that's paying the bills. Anything regarding the cost or finances of your visits, she has access to. She CANNOT get access to the doctor's notes, though. It's only MONEY rights that she has.
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