Wiki 93642 with in global period

I am billing 93642 within the 90day global.Do I use a modifier or not???

Yes, it will always need a modifier in the global. However, if your provider mentioned in his original op report that he planned on doing the NIPS at a later date for whatever reason because he couldn't test the device at the time of placement, you could append modifier 58 as it was a staged procedure. If there is no mention of doing it later, then 79 is correct.
 
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