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I agree that 64479 thru 64487 and 64490 thru 64495 are unilateral procedures, and for bilateral procedures most insurances use a 50 modifier. This information can be found in the AMA CPT professional book.I always use my paper books as a back up reference.
If the Dr only documented a TFESI on the right at L3 and a TFESI on the left at S1 your coding would be:
64483 RT (L3)
64484 LT (S1)
Just my opinion you should check your references to be sure.
Good Luck
Davieda Skobel CLPN, CPC
Columbus, Ohio