Yes you can get the selffinance college in kerala with your marks and all you need to do is to go for the counselling rounds by the admission committee of your state and you have to fill the choices and according to your marks you will be allotted the medical college. Go through the link provided which gives you the information about the private medical colleges in kerala and other details which might be helpful for you to get the better counselling.

https://medicine.careers360.com/colleges/list-of-private-medical-colleges-in-kerala

Heyy
Self financing college release cut off based on three categories that is state merit, ST and SC. With 473 marks and belonging to obc category I think you might not get self financing medical college in kerala. As per previous year the cut off govt self financing college in Kerala for state merit was 522 and cut off of private self financing college was 481.
Here is a link which has list of colleges of kerala with their previous year cut off.
http://www.medicine.careers360.com/articles/neet-cutoff-kerala
We are predicting this on the basis of previous year cut off trends. We. Are not sure about this year cut off as it changes every year depending on no.of candidates, no.of seats and difficulty of exam. So hope for better result this time.
Here is a tool which can predict college on the basis of neet score. I hope this might help you
https://medicine.careers360.com/neet-college-predictor?icn=NEET_clgpd&ici=NEET_article_view_sticky