The 51 modifier is basically letting the carrier know there are more than one procedure (multiple procedures performed) (not used in some settings, depends on who you are billing for)
The 59 modifier is to let the carrier know its a separately identifiable different location/site. (trying to sum this up but this one can be much more complicated)
Lets say you are having the same procedure done on two different toes. The CPT code is exactly the same. You would want to identify the 2nd code with the 59 modifier otherwise they bundle them.
Hope this helps.
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