RFA of Sacroiliac Joint

I have a question of the best way to bill for the RFA of the sacroiliac joint. A CPT Assist article advises to bill 64640, 64640-59, 64640-59 and 64640-59. Other coders just bill 64640 X 4.

Any advice.

Also, if you are billing with the 59 modifier, would we now use one of the new "X" modifiers for 59. If so, which one?

Thank you!

RFA of Sacroiliac Joint