Your legal status doesn't affect whether you get approved or not. They just ask for social #. The most important thing is that you have some sort of credit history and list some sort of annual income (which they don't even verify). As far as I know, Carecredit is intended to make medical treatments affordable for people so I think it is much easier to get approved. The only problem I see is if you have bad credit history or no history at all. If you apply, just apply at the doctors office or something. They will tell you right then and there if you were approved.