Can I use financing to pay my deposit? Or does it have to be cash ?

I was approved for $13,500 in financing . Care Credit ($7000) & Alpheaon Credit ($6500). I’ve been speaking with places and they stated they wanted a cash deposit to hold my spot & that I couldn’t use any of my financing . I was just curious is that common or or are there some places that except the financing for the surgery and the deposit ?