Page 15 (xv) of the CPT Introduction section states the following:
"All Add-on codes found in the CPT codebook are exempt from the multiple procedure concept (see the modifier 51 definition in Appendix A)."
Considering the fact that you cannot use an add-on code by itself, it stands to reason that any modifier that is appended to the primary procedure automatically applies to the add-on code. I believe omitting it, especially in a post op period, or in situations where unbundling issues might be raised, could easily lead to a denial. That's my 2 or 3 cents anyway! Erin
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