Yes, the best excuse is to tell them you have gynecomastia (I had to look up the spelling) if you didn't want them to know of transitioning. My lady doctor didn't even call it gynecomastia, though. She just called it a swelling of the breast and ordered me a mammogram! Made me feel feminine, even though it was a bit embarrassing. The mammogram, by the way, wasn't bad at all, the way they do it now.