Visited in ER by billing while getting care?

I recently had an ER visit, and while I was receiving care in my room I was suddenly visited by a lady carting in a computer and asking if I can pay for my visit. Literally took my credit card swiped it and gave me a receipt. It was really off putting, like it couldn't wait. Is this normal? I'm a KP member and have never been in the ER before.

More potentially related info is that I was traveling for more than a month and missed a KP bill that was due while I was away, so I wondered if I was flagged in some manner to receive that kind of visit in the ER.