Difference between modifier 78 & 79

lcole7465

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I'm new to using the different modifiers, I coded anesthesia for the last few years and only had a couple that were applicable with anesthesia. I'm looking for a good reference for the difference between using the -78 and -79 modifiers.

The example I have is that a patient had a pain management procedure (64633), this procedure has a 10 global period. The patient came back within the global period to have the procedure done again. I didn't see any documentation that it was a staged procedure so I think the -58 wouldn't apply.

Thanks
 
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