Wiki SA Modifier

[reaganm222]

We have been billing all of our PA claims with SA modifiers, including in office procedures such as biopsies and freezings. We now have a billing company telling us that's incorrect and the SA modifier only belongs on the office visit. However, when we only put the SA mod on the ov, the claim is paying the other lines at the full MD allowable which is incorrect. I know the SA modifier says "A supervising physician should use this modifier when billing on behalf of a PA, ANP, of CRNFA for non-surgical services. (Modifier SA is used when the PA, ANP, or CRNFA is assisting with any other procedure that DOES NOT include surgery.)" but I don't believe that includes in office procedures. I can't find any documentation on this. Help!