For my first we used Capital One Healthcare Finance, their interest rate was like 18%. They don't do medical loans anymore.
For this one we tried reaching out to medloanfinance.com, $1200 fee to start the 10k loan, then like 14% interest rate, no way were we doing that.
We checked out Carecredit.com and it too had horrible rates.
We wound up getting approved through Keybank (not even our normal bank) for a 15k line of credit with a 10 year draw period (we can pay back and borrow as often as we want for 10 years) with an 11% interest rate.
So in summary, try an unsecured loan from your bank first. Good luck!