I don't have any thing to back me up per se. But it is common knowledge in the coding industry that the 59 modifier is called the "unbundler". You only use that modifier when two CPT codes are intrinsically connected. Such as a 45385 and a 45380. Then you must have two seperate anatomical sites of the colon (sigmoid and transverse for example) to show those two seperate sights.
And if you look in the CPT book a 51 modifier states "multiple procedures" not "multiple surgeries".
It also why a couple of years ago Medicare came out and told us to stop putting the 51 modifier on the EGD's when there was also a colon as their software does it automatically and it was messing up the claims.
Now you can use encoder pro all you want when it comes to modifiers but if it states surgeries for 51, I'm going to keep looking at the AMA, the one's who create the CPT's and know what goes with what.
To add to it, United Healthcare has told the practice I work for to use a 51 on the EGD if there is a colon done and to use the 59 if there was more than one colon (or EGD) procedure done (ie 45380 and 45385) doesn't even matter if there is an CCI or not for bundling.
45380 (59 mod)
43239 (51 mod)
43248 (51 mod)
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