I agree that if you are uncomfortable providing any information, then don't do so! Either talk to the therapist about it, or find someone else.

However, just a note on the credit card thing....I pay completely out of pocket for my T, and she accepts credit cards. I wanted to use my cc so that I could collect the mileage points (figure, if I'm spending this much money, I should get points for it, right?) For the first year, I paid cash, then switched to cc. My charges from my T show up as "PROF CHARGE." No where on that charge does it have my T's name, and in the merchant description, it simply says "Medical Services and Health Practitioners (not classified)". So, anyone looking at my statement would not be able to tell any more than that I have a regular charge for some kind of medical/health service. In the two years that my T has been charging my cc, I've had no issues with it, and come tax time, it makes it super easy to figure out the appropriate deductions, because my expenses are all in one place.