Keeping my health problems oblivious to parents?

I need to see a doctor desperately-- probably have a minor surgery, but I don't want to tell my parents (we don't have a good relationship) yet they'll get the insurance information (mail, email, etc.).

I'm 18+ so is there a way for me go without them completely knowing? I don't want to spend all of my money having to pay cash, as mentioned before; my relationship with my parents is rough and I need to move out ASAP.

I'm in a lot of pain, but I'd rather suffer through it till the day I day rather than tell them squat about my issue (s).
Keeping my health problems oblivious to parents?
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