Hi Sher, it is great if it is incorrect, but when I went to inquiry about a month ago (at their office in Once) they were fine with just the passport but she said that they didn't accept cash, and that I should ask a friend with a bank account here to do the transfers for me. Maybe that was specific to that office? Or maybe I got it wrong, which is quite possible. Definitely makes it a lot easier for those of us without local bank accounts when we can pay in cash!
Thanks Noruega, the info is useful for anyone who is considering the options.
I have always gone to the office on Santa Fe and Billinghurst. It is always busy, but they actually seem to move quite quickly there. I had to visit them to arrange the redelivery of my health insurance card when I wasn't home to sign for it the first time. They were very friendly and the card arrived within a few days. It has been the most straightforward and quickest process that I have experienced when signing up for health insurance anywhere. I have been to that office about four times and the experience has always been the same. Probably one of my best customer service experiences in Buenos Aires so far.