Modifiers?

Are these modifiers still being used in private practice? And if so how are they getting paid -59 (for a distinct separate procedure). I use this when I do an epidural and they want a knee injection too. Does it pay 100% of both codes? -25 (add on procedure to a clinic visit) I do this when I see them for back pain and they want a joint injection too. Again does it pay 100% of both codes? -50 (bilateral modifier) I assume everyone gets paid 1 1/2 times the usual code. Correct?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums