My understanding is that you are viewed as the same provider as long as you are under the same taxonomy (which you would be).
I think you are thinking of the wrong code since that one is a non-face to face time code that is not an add on and is not allowed at the same time as an E/M code (
The 5 Point Checklist for CPT Codes 99358 and 99359). I think you may be thinking of 99356 which is the standard prolonged inpatient face to face service time code. In order to bill this however the original provider needs to be billing by time and document that time (eg 70 minutes face to face admitting a level 3) then you need to document you spent (at least) 30 minutes additional face to face caring for that person in order to justify the charge (assuming they billed at the top of the charge, if they billed as a level 3 but only document 30 minutes spent then you have to spend 40 to get to 70, then an additional 30 all face to face of course). As you can imagine it is a bit hard to justify most of the time. You can contort yourself every which way to document that you spent 2 hours in a patients room to get an extra 4 wrvu meanwhile ortho did a knee in the same time period and got 45 wrvu or just accept your fate and move on.
It is some bull**** of the highest order that inpatient E/M billing places a value of exactly $0 for work you do on the same day as an admit (or cross-covering) unless it is spent in the patient's room, arguably the place in the hospital where you accomplish the least as an IM physician. Even after these amazing EM billing changes CMS conjured up this still hasn't been addressed but thems the breaks... Thank you for your charity service you hero!